How To Test Car Battery Amps With a Multimeter

When you have car trouble like your headlight wouldn’t come on, and even if they do, it wouldn’t be with the usual brightness, so then you get your vehicle to the mechanic, and the only reply you get from them is to replace your battery.

That would be an embarrassing situation, more than that it might get you confused as you may wonder how your battery that was working fine a while ago suddenly needs a replacement.

You should always take the amp test to estimate the remaining service life your car battery has, to know if your battery has enough and to crank your car engine, and also to ensure that the current flowing through your words are not more than they can handle.

Although, there are many battery testers, one very accessible tool is the multimeter.

Now that you know how important this test is, you would be wondering “How to test car batteries with a multimeter?” We have some tips you can follow that would guide you on how you carry this tests out. 

how to test a multimeter1. Test Your Meter

The first thing to do is to test your meter; you can do this by setting the functions to ohms.  When you connect the test leads, the readings should be approximately zero, and the readings should be 1 when the connection is separated. If your battery is not following this pattern, then something is wrong with it.

2. Determine the Amperage Rating of Your Multimeter

The next step is to determine the amperage rating for your multimeter, so you don’t have an additional problem of fixing fuses. Each multimeter models are built to handle a certain amount of current, and the rating needs to be adequate to test your car battery. You can do this by checking the owner’s manual of your device.

3. Select the Appropriate Function On your Multimeter

Most multimeters have several functions, so select the appropriate function on your multimeter. When you measure amperage for your car battery, select for direct current amperage. You have to do this because the power source for your system determines the type of current that would be measured.

4. Set the Range on Your Multimeter

Fluke 87-V

Next thing to do is to set the range on your multimeter well above the expected readings to create a maximum amperage sensitivity of your device. You should do this to avoid blowing up your fuse. In situations where your multimeter is not reading anything when it is connected to your system, reduce the range of your device. 

5. Connect the Multimeter to your Batteries

A proper multimeter like Fluke 87V (read more on would come with two cords which should have a probe on one end and a lead on the other. So ensure you plug the cords into the correct terminals. Connect it positive to positive and negative to negative. Also, your owner’s manual would be of great help in this case.

6. Ignite Your Car

The final step you would eventually have to take is to run the circuit through the multimeter to measure the current, but before you do this, it is crucial that you take some safety measures.

You should ensure you wear protection for your eyes, gloves for your hands, and other protective clothing. Another important thing is to remove all your jewelry because they may be conductors of electricity. When you are sure of your safety, then ignite your car.


When you are having problems with your car wouldn’t be a good time to push blames, but you could be part of the reason why there is something wrong with your electrical battery drain, and it could also be that your battery is too old and it requires a replacement.

Although, as car owners, you should always check your battery amps to be sure that they are getting charged appropriately while they are connected to your car so that they would have a correct working order.

There are different tests you should carry out on your car battery, but apart from the voltage test that helps you determine the level of charge of your battery, another test you should carry out is the amperage test.

The amperage test would help you know the amount of electrical current that is running through the electrical components in your car, such as wires, by measuring the number of electrons that are passing a given point at a particular time.

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