88 Techniques For Measuring Battery Voltage Using A Multimeter

Today’s topic is How To Use Multimeter To Measure Battery Voltage. Obviously, you can find a great deal of Measure Mah Battery-related content online. The proliferation of online platforms has streamlined our access to information.

There is a connection between the How to Test a Car Battery With a Multimeter and How To Measure Voltage With A Multimeter information. more searching has to be done for Check Rechargeable Battery Health Multimeter, which will also be related to Multimeter 9V Battery Test.

88 Tips for How To Use Multimeter To Measure Battery Voltage | Cr2032 Voltage Test

• Advanced multimeters might have other functions, such as the ability to measure and identify other electrical components, like transistors or capacitors. Since not all multimeters have these features, we will not cover them in this tutorial. You can read your multimeter’s manual if you need to use these features. - Source: Internet
• First, find the socket that you want to measure. In most cases, it will be labeled with the voltage it provides. If it is not labeled, you can test it by plugging in a device that requires a specific voltage to operate. - Source: Internet
• A car battery with a full charge should have at least 12.6 volts and measure at 13.7-14.7 when the engine is running. - Source: Internet
• If your multimeter is not auto-ranging, you might need to adjust the range. If your multimeter’s screen just reads “0,” then the range you have selected is probably too high. If the screen reads “OVER,” “OL,” or “1” (these are different ways of saying “overload”), then the range you have selected is too low. If this happens, adjust your range up or down as necessary. Remember that you might need to consult your multimeter’s manual for specifics about your model. - Source: Internet
• Do you have rechargeable batteries? You can test their voltage over time as they recharge, and then make a plot of voltage vs. charge. How long does it take for the voltage to stop increasing? Is the graph a straight line? - Source: Internet
• The multimeter will then display the current amperage of the battery. If the battery is able to provide enough power to start your vehicle, the amperage should be around 12 volts. If the amperage is lower than 12 volts, it may not be able to provide enough power to start your vehicle. - Source: Internet
• Multimeter readings in the range of 1.3-2.9 Amperes indicate that it is better not to use a battery in ordinary household appliances, but it can be installed in devices that consume a small amount of current (for example, television or other remote controls). - Source: Internet
• Do you have anything you can take apart with a circuit board inside, like an old toy, or a TV remote? Use the continuity check on your multimeter (if it has one) to test which parts of the circuit are directly connected to each other. ( Warning: Old circuit boards are constructed with a lead-based solder, which is toxic. Always wash your hands carefully after handling solder, and check your local waste disposal guidelines to see if there are special rules about disposing of lead as hazardous waste.) - Source: Internet
• Some multimeters also have a diode check function. A diode is like a one-way valve that only lets electricity flow in one direction. The exact function of the diode check can vary from multimeter to multimeter. If you’re working with a diode and can’t tell which way it goes in the circuit, or if you’re not sure the diode is working properly, the check feature can be quite handy. If your multimeter has a diode check function, read the manual to find out exactly how it works. - Source: Internet
• Figure 3. The multimeter on the left is manual-ranging, with many different options (indicated by metric prefixes) for measuring different amounts of voltage, current, and resistance. The multimeter on the right is auto-ranging (note how it has fewer options for the selection knob), meaning it will automatically select the appropriate range. The multimeter on the left is manual-ranging, with many different options (indicated by metric prefixes) for measuring different amounts of voltage, current, and resistance. The multimeter on the right is auto-ranging (note how it has fewer options for the selection knob), meaning it will automatically select the appropriate range. - Source: Internet
• When you use your multimeter to conduct the first test, you will be measuring the direct current voltage. Where you see the letter “V,” look above it and you will notice dashed and solid lines that indicate the voltage. Turn the dial so that it is set to 20. This will give you the ability to measure from 0 to 20 volts. - Source: Internet
• The same value might appear differently when measured with a different scale selected on the multimeter dial. For an example, let’s use measuring the DC voltage from a AA battery—which we expect to be 1.5V—using a multimeter that has settings for 200mV, 2V, 20V, 200V, and 600V. When measuring the battery with each setting, we get these readings: - Source: Internet
• Why does the meter knob read 20V and not 10V? If you’re looking to measure a voltage less than 20V, you turn to the 20V setting. This will allow you to read from 2.00 to 19.99. - Source: Internet
• Black to negative, Red to positive. We don’t have any picture of this on a Jeep battery, so a PC power supply as an example. Touch the black to the ground, red to the positive, and the battery shows 12.57 volts. - Source: Internet
• So with the engine running (and being mindful about moving parts) conduct the same battery test as above with your multimeter. A healthy charging system should give a reading of between 13.8V and 14.4V at regular idle speed. - Source: Internet
• Any multimeter can help you perform basic tests and get simple answers. Units can range from $20 into the $100’s. However much you’d prefer to spend on one would be completely up to you, but any one of them would work. - Source: Internet
• There are three examples of meters here, the one on the left cost $10, the one in the middle cost around $20, and the one on the right cost around $35. The one in the middle, it’s a basic digital multi-meter, is generally the best to get. The cheap one will get you by, but it’s harder to tell exact voltages on that analog display. - Source: Internet
• Voltage is how hard electricity is being “pushed” through a circuit. A higher voltage means the electricity is being pushed harder. Voltage is measured in volts . The symbol for volts is V . - Source: Internet
• Once you have found the socket, set your multimeter to Volts AC (alternating current). Touch the multimeter’s probes to the two metal prongs on the socket. The voltage will be displayed on the screen. - Source: Internet
• To measure the current through a lightbulb the multimeter becomes part of the circuit and transfers electricity from the battery to the lightbulb. The positive probe of the multimeter (red) is connected to the positive side of a battery while the negative probe of the multimeter (black) is connected to one lead of a lightbulb. The free lightbulb lead is then connected to the negative side of the battery using wire. Current will flow from the battery to the multimeter and then into the lightbulb. - Source: Internet
• If your battery is consistently charged at less than 80%, acid stratification can occur. This means that the electrolyte collects at the bottom of the battery, causing the upper half to be acid-poor. Acid stratification reduces the battery’s performance and may cause it to fail. - Source: Internet
• 4. Finally, read the number that appears on the multimeter display. This is the voltage of your battery. - Source: Internet
• Hook the multimeter leads up to a speaker using speaker wire, and set the multimeter to measure AC amps (or AC volts if AC amps is not available). Who can get the multimeter to display the biggest number by yelling into the speaker? (In this case, the speaker is working like a microphone, generating current when it detects sound.) - Source: Internet
• You might be confused by all the symbols on the front of your multimeter, especially if you don’t actually see words like “voltage,” “current,” and “resistance” spelled out anywhere. Don’t worry! Remember from the “What are voltage, current, and resistance?” section that voltage, current, and resistance have units of volts, amps, and ohms, which are represented by V, A, and Ω respectively. Most multimeters use these abbreviations instead of spelling out words. Your multimeter might have some other symbols, which we will discuss below. - Source: Internet
• To use it you first select DC voltage on the dial. The photo above shows a typical symbol you’ll see that represents DC voltage. The display should then show something like the above indicating DC voltage is being shown. - Source: Internet
• Figure 2. In a basic series circuit (left), each element has the same current (but not necessarily the same voltage; that will only happen if their resistances are all the same). In a basic parallel circuit (right), each element has the same voltage (but not necessarily the same current; that will only happen if their resistances are all the same). In a basic series circuit (left), each element has the same current (but not necessarily the same voltage; that will only happen if their resistances are all the same). In a basic parallel circuit (right), each element has the same voltage (but not necessarily the same current; that will only happen if their resistances are all the same). - Source: Internet
• The left image is a multimeter with no probes inserted. The center image is a multimeter that has a black probe inserted into the center port and a red probe inserted into the right-most port. This setup is rated to measure current under 200 milliamps. The right image shows a multimeter that has a black probe inserted into the center port and a red probe inserted into the left-most port. This setup is rated to measure current up to 10 amps. - Source: Internet
• You will probably need to open up your multimeter to access the fuses (Important: Always disconnect the probes before you do this). Some multimeters have covers that will pop or slide off, and some have screws that must be removed first. Fuses usually look like small, glass cylinders with metal caps on the end and a thin wire running down the middle: - Source: Internet
• When you test your car battery with a gauge, a good reading would be around 12.6 volts. The best way to get an accurate reading is to leave your car battery off for over an hour, or just test it in the morning after it’s been idle all-night long. Then you will get what is known as the “resting voltage,” which will truly tell you whether your battery is still good or not. - Source: Internet
• March 3, 2019. Testing your battery is something you may not associate with regular car maintenance like getting an oil change, but the battery is needed for everything from starting your car to powering your car’s computers and devices. Dead batteries are a common reason for roadside assistance calls and making sure your battery is in good condition could prevent the hassle of your car breaking down unexpectedly. You can check your car battery quickly and easily yourself. - Source: Internet
• Few things can ruin an adventurous road trip as quickly as a dead battery in a small town in the middle of nowhere – and with no mechanic. A car’s battery is essential to giving the starter motor the energy required to turn the flywheel until the engine reaches self-sustaining combustion. A few minutes of pre-departure preparation can determine if your battery is healthy enough to make the trip. Testing the battery can also help determine if slow-starting is caused by the battery or another issue. - Source: Internet
• Want to check for voltage say to a fuse inside the Jeep. Touch the black lead to anything metal, a seat bolt for example, for a ground. Touch the red lead to the fuse socket, (try both sides, only one side of a fuse socket is live without the fuse), should come up with 12 volts if it’s live. - Source: Internet
• If you haven’t heard of these terms before, we’ll give a very simple introductory explanation here. You can read more about voltage, current, and resistance in the References tab, above. Remember that voltage, current, and resistance are measurable quantities that are each measured in a unit that has a symbol, just like distance is a quantity that can be measured in meters, and the symbol for meters is m. - Source: Internet
• The multimeter can measure both DC and AC voltage. To use a multimeter, ensure that first, you have set the meter into either DC or AC, depending on the type of currency you need to measure. Secondly, ensure that the probes are connected properly to the meter. The red probe is always connected next to a V marking and the black probe on the COM again. This will depend on the type of meter that you choose to use. - Source: Internet
• A car battery doesn’t just go bad completely. There will likely be one or more battery cells which are bad in it. You will know if this is the case when you start your car because it will take more time to crank up the engine. - Source: Internet
• If you want to test the cells individually, then a hydrometer-type of battery tester is needed because it can measure the battery acid’s gravity. You will know if the cell is bad or good based on how many balls are floating. Even if you know that you have dead cells, it would be like knowing that your battery can’t hold a charge that is 12.6 volts. Therefore, you might as well do the resting voltage test because it is faster, easier, and just as effective. - Source: Internet
• A multimeter is a handy tool that you use to measure electricity, just like you would use a ruler to measure distance, a stopwatch to measure time, or a scale to measure weight. The neat thing about a multimeter is that unlike a ruler, watch, or scale, it can measure different things — kind of like a multi-tool. Most multimeters have a knob on the front that lets you select what you want to measure. Below is a picture of a typical multimeter. There are many different multimeter models; visit the multimeter gallery for labeled pictures of additional models. - Source: Internet
• This method is applied to new batteries and allows you to evaluate their power immediately upon purchase. The position of the multimeter must correspond to DC current. To measure the amount of charge on a new battery, proceed as follows: - Source: Internet
• We can then see how much voltage the LED is using. This is what is referred to as the voltage drop across the LED. If that doesn’t make sense now, fear not. It will as you explore the world of electronics more. The important thing to take away is that different parts of a circuit can be measured to analyze the circuit as a whole. - Source: Internet
• Figure 4. A typical pair of multimeter probes. A typical pair of multimeter probes. - Source: Internet
• A multimeter is a great tool that everyone should take the time and learn how to use properly. A multimeter can tell you if the battery is good, the alternator is charging, or if there is a break in a wire. It can test a connection, and can test vehicle sensors (TPS / MAP / Crank / etc), along with many other things. - Source: Internet
• Batteries are commonly located in the engine bay to one side of the engine. If the battery is not immediately obvious when you open the hood, consult the owner’s manual. In modern cars, the battery will often have a plastic cover which will unclip, hinge up, or occasionally require removing with a few bolts or screws. There may also be a red cover over the positive (+) terminal that will lift off or snap open, too. - Source: Internet
• Do you have a multimeter but are confused about how to use it or are getting unexpected readings? If so, the sections below will help you sort through what to do. If there are words or concepts you do not understand, or symbols on your multimeter that puzzle you, return to the Multimeter Overview tab. If you are looking for multimeter usage ideas or labeled photographs of assorted multimeter models, then visit the other tabs in this multimeter tutorial. - Source: Internet
• A negative voltage is a measure of electron potential or energy. It is measured in volts and has the symbol “-V.” The higher the negative voltage, the more potential energy or electrons are available. This can be useful in electrical circuits to move electrons from one place to another. - Source: Internet
• Some multimeters have a continuity check, resulting in a loud beep if two things are electrically connected. This is helpful if, for instance, you are building a circuit and connecting wires or soldering; the beep indicates everything is connected and nothing has come loose. You can also use it to make sure two things are not connected, to help prevent short circuits. - Source: Internet
• The diode check feature is useful to determine in which direction electricity flows through a diode. The exact operation of the “diode check” function will vary for different multimeters, and some multimeters do not have a diode check feature at all. Because of this variety, and because the feature is not required for most Science Buddies projects, we have not included directions here. If you need to do a diode check, consult the manual for your multimeter. - Source: Internet
• First things first, knowing a battery cell is dead is of no more use to you than knowing that the battery won’t hold a 12.6 volt charge, because you can’t fix it. So, a test of the resting voltage is just as effective a diagnosis. - Source: Internet
• 5. If your battery is 12 volts or higher, it is considered healthy. If it is below 12 volts, it may need to be replaced. - Source: Internet
• Instructions for changing the fuse vary with each multimeter model, so you will need to check your multimeter’s manual for instructions. This tutorial from SparkFun provides directions for changing a fuse on their brand of multimeter, but remember that these directions might not apply to your model. Note that in some multimeters-especially in inexpensive ones-you might not be able to change the fuse. - Source: Internet
• In conclusion, it is evident that AA batteries can be tested using a couple of ways, which include the drop test, use of a voltmeter, and lastly, by the use of a multimeter. Using the three methods to test your battery, you will always get to know when your battery is bad. You should remember that some types of batteries cannot use the drop test battery due to safety measures. - Source: Internet
• 4. Check Engine light is on: In some cars, the Check Engine light will come on if the battery voltage is low. So if you see this light illuminated on your dash, it’s a good idea to get your battery checked out. - Source: Internet
• The remaining elements are retested. Now let’s figure out how to check the battery capacity under load. To do this, proceed as follows: - Source: Internet
• First, you will need to connect the positive lead of the multimeter to the positive terminal of the battery. Next, you will need to connect the negative lead of the multimeter to the negative terminal of the battery. Finally, you will need to turn on the multimeter and set it to the amperage setting. - Source: Internet
• You can also use a 12 volt test light to check the amperage of your battery. To do this, you will need to connect the positive lead of the test light to the positive terminal of the battery. Next, you will need to touch the negative lead of the test light to the negative terminal of the battery. If the test light lights up, it means that the battery has enough power to start your vehicle. - Source: Internet
• You might have noticed some other symbols besides V, A, Ω, and metric prefixes on the front of your multimeter. We’ll explain some of those symbols here, but remember, all multimeters are different, so we cannot cover every possible option in this tutorial. Check your multimeter’s manual if you still can’t figure out what one of the symbols means. You can also browse our multimeter gallery to see labeled pictures of different multimeters. - Source: Internet
• If the voltage shown when checking the battery with a multimeter is more than 1.35V, the battery is good and will work in any electrical appliance. If the cell charge is less than this level, but not lower than 1.2V, it can be used in undemanding devices. At a lower charge level, the battery cannot be used and must be disposed of. - Source: Internet
• What happens if you select a voltage setting that is too low for the voltage you’re trying to measure? Nothing bad. The meter will simply display a 1. This is the meter trying to tell you that it is overloaded or out-of-range. Whatever you’re trying to read is too much for that particular setting. Try changing the multimeter knob to a the next highest setting. - Source: Internet
• Most multimeters also use metric prefixes. Metric prefixes work the same way with units of electricity as they do with other units you might be more familiar with, like distance and mass. For example, you probably know that a meter is a unit of distance, a kilometer is one thousand meters, and a millimeter is one thousandth of a meter. The same applies to milligrams, grams, and kilograms for mass. Here are the common metric prefixes you will find on most multimeters (for a complete list, see the References tab): - Source: Internet
• Although they come with two probes, many multimeters have more than two places in which to plug the probes, which can cause some confusion. Exactly where you plug the probes in will depend on what you want to measure (voltage, current, resistance, continuity test, or diode test) and the type of multimeter you have. We have provided one example in the images below—and you can check our gallery for a multimeter similar to yours—but since all multimeters are slightly different, you might need to consult the manual for your multimeter. - Source: Internet
• But make sure that the batteries have not been charging and that there have been no big loads running for at least an hour before you measure the voltage in order to determine the SOC. During this time the battery voltage will be misleading. Certainly during the actual charging or when the load is running the voltage will not represent the SOC. However, these things don’t affect the specific gravity of the electrolyte (fluid) in the battery. - Source: Internet
• Another thing to remember with newer cars is that if an electrical source causes the power to be drained from the battery, this is called “parasitic loss.” This can happen when your engine and all the vehicle’s lights are turned off too. Why? Because there are certain electronic systems and features in your car which are still consuming power after your car is turned off, such as the clock and computer. These things won’t normally drain too much power from your battery but if you suspect they are, then either remove the battery completely or simply disconnect it. - Source: Internet
• To measure the voltage of the entire battery bank then you need to find the battery bank’s positive and negative terminals. These are the terminals that have the cables going to the rest of the solar system (e.g. inverter, charge controller.) - Source: Internet
• We can test different parts of the circuit as well. This practice is called nodal analysis, and it is a basic building block in circuit analysis. By measuring the voltage across the circuit we can see how much voltage each component requires. Let’s measure the whole circuit first. Measuring from where the voltage is going in to the resistor and then where ground is on the LED, we should see the full voltage of the circuit, expected to be around 5V. - Source: Internet
• The normal current for a new battery should be 4-6 Amps.If it is 3-3.9 Amperes, this means that the battery’s service life is reduced, but the cell is suitable for use in portable equipment. - Source: Internet
• This LED is using 2.66V of the available 5V supply to illuminate. This is lower than the forward voltage stated in the datasheet on account of the circuit only having small amount of current running though it, but more on that in a bit. - Source: Internet
• use a multimeter to test electricity from the wall outlets in your home. Electricity from wall outlets is very dangerous and can be fatal. Do not connect the probes directly to a battery or other power supply when you have a “current” measurement setting selected. This will cause a “short circuit” across the battery terminals, and a very high current will flow through your multimeter. This will probably blow a fuse, or possibly damage the multimeter. - Source: Internet
• One thing to bear in mind is that all modern cars experience ‘parasitic loss’, which is when something electrical drains the battery even with the engine turned off. So, systems such as the clock, computer and alarm use some power. If you suspect this is killing your battery during storage, you might be wise to disconnect the battery or remove it entirely. - Source: Internet
• To test battery voltage with a multimeter, first, make sure that the meter is set to the correct voltage range. Next, connect the black lead to the battery’s negative terminal and the red lead to the positive terminal. Be sure not to short the leads together! Finally, find the voltage on the screen and write it down. - Source: Internet
• Thirdly, connect the red probe to the red terminal of your device or a battery that you are testing and do the same to the black probe and the negative terminal. Once the connection is complete, note down the reading on display. Always ensure the probes are connected to the right ports because once you interchange, your readings will be the same but will come out negative. - Source: Internet
• If you suspect your battery is failing, stop by your local Advance Auto Parts. Advance offers quick curbside testing without you needing to leave your vehicle. If you need a new battery, a knowledgeable Team Member will help you select the right one for your vehicle and install it for you while you wait*. Advance will even recycle your old battery for you. Learn more about free services here. - Source: Internet
• Finger-type batteries are used in many modern devices as batteries. Although outwardly these products are indistinguishable from each other, their technical parameters, as well as cost, can vary significantly. In order not to get into a mess by purchasing a product with a small resource, or even completely inoperative, you should know how to check these elements, and be able to do it in practice. This skill will come in handy when checking the batteries accumulated at home - if one of them is in a landfill, then others can still serve in devices that do not differ in power. In this article we will figure out how to check the battery with a multimeter, and at what amount of residual charge it can be used in electrical appliances. - Source: Internet
• The first digit on many multimeters is only able to display a ‘1’ so the ranges are limited to 19.99 instead of 99.99. Hence the 20V max range instead of 99V max range. - Source: Internet
• This is the most common case for beginners when measuring DC voltage. To fix this, just switch the leads at measuring points. The red probe must be connected with a positive measurement point and the black probe with a negative dot. - Source: Internet
• Most multimeters (except for very inexpensive ones) have fuses to protect them from too much current. Fuses “burn out” if too much current flows through them; this stops electricity from flowing, and prevents damage to the rest of the multimeter. Some multimeters have different fuses, depending on whether you will be measuring high or low current, which determines where you plug the probes in. For example, the multimeter shown in Figure 5 has one fuse for 10 amps (10A) and one fuse for 200 milliamps (200mA). - Source: Internet
• Your multimeter probably came with red and black wires that look something like the ones in Figure 4. These wires are called probes or leads (pronounced “leeds”). One end of the lead is called a banana jack; this end plugs into your multimeter (Note: some multimeters have pin jacks, which are smaller than banana jacks; if you need to buy replacement probes, be sure to check your multimeter’s manual to find out which kind you need). The other end is called the probe tip; this is the end you use to test your circuit. Following standard electronics convention, the red probe is used for positive, and the black probe is used for negative. - Source: Internet
• Direct current (abbreviated DC) is current that always flows in one direction. Direct current is supplied by everyday batteries—like AA and AAA batteries—or the one in your cell phone. Most of the Science Buddies projects you do will probably involve measuring direct current. Different multimeters have different symbols for measuring direct current (and the corresponding voltage), usually “DCA” and “DCV,” or “A” and “V” with a straight bar above or next to them. See “What do all the symbols on the front of the multimeter mean?” for more information about the abbreviations and symbols on multimeters. - Source: Internet
• Remember, this gallery is meant to be a general guide; if you do not see your model of multimeter pictured here, your best bet is to consult your specific multimeter’s manual. If you need help getting introduced to multimeters in general, refer back to our Multimeter Overview section. If you need to know how to take a specific type of measurement, refer to the Using a Multimeter section. - Source: Internet
• If you’re measuring DC voltage (such as a battery or a sensor hooked up to an Arduino) you want to set the knob where the V has a straight line. AC voltage (like what comes out of the wall) can be dangerous, so we rarely need to use the AC voltage setting (the V with a wavy line next to it). If you’re messing with AC, we recommend you get a non-contact tester rather than use a digital multimeter. - Source: Internet
• The resting voltage should ideally be no lower than 12.6V. A battery that reads 12.2V is actually only 50% charged, and is classed as discharged below 12V. - Source: Internet
• There are two ways to measure battery voltage. The first is from displays on things like inverters, charger controllers, … The second is using a volt meter. Both of these are talked about below. - Source: Internet
• Old circuit boards are constructed with a lead-based solder, which is toxic. Always wash your hands carefully after handling solder, and check your local waste disposal guidelines to see if there are special rules about disposing of lead as hazardous waste.) Set your multimeter to measure resistance, and have everyone in your house take turns grabbing the metal tips of the probes (one in each hand). Who has the highest resistance? The lowest? - Source: Internet
• The newer batteries in cars don’t give you access to the cells because they are meant to be “maintenance free.” But if you have an older battery, you will be able to view each cell. There may be a plastic cover over the cells or a separate cap for each one. Be careful if you decide to investigate the battery cells because they contain sulfuric acid mixed with water. If you were to get this mixture onto your skin, it could become very painful and lead to an injury. - Source: Internet
• You can use a multimeter to test the voltage of your car battery at home. This is a simple and easy way to check if your battery is healthy or needs to be replaced. Follow the steps above to get an accurate reading of your battery’s voltage. - Source: Internet
• A negative voltage is a type of voltage that is less than zero. In other words, it is a voltage that is pointing in the opposite direction of positive. A negative voltage is often used in electrical systems to control power flow. - Source: Internet
• At 26.6 degrees Celsius a reading for a battery with a good charge is about 12.5 volts or higher, 12.3 volts means about a 75% charge, 11.8 volts or lower means 25% or less. - Source: Internet
• If the multimeter reads less than 12.6 volts, disconnect the battery and fully charge it using a battery charger. Then let it rest overnight. If it holds a charge when it’s not connected to the car – something is draining the battery far faster than the computer memory and digital clock. - Source: Internet
• When you go to test the alternator with the multimeter, you will do it the same way as you did the battery test. Be sure to keep your engine running this time as you do the test. Your alternator will be good if you get a reading of at least 13.8 volts, but preferably up to 14.4 volts. - Source: Internet
• If you have less than 13.8 volts or higher than 14.4 volts, then your alternator is undercharging or overcharging. Either one of these situations could mean that your battery life is running short and that you need to investigate the problem further. - Source: Internet

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