Wednesday, August 19, 2020

How To Use A Multimeter To Test A Car Battery Drain

Each multimeter models are built to handle a certain amount of current and the rating needs to be adequate to test your car battery. One of the diodes may have shorted out and caused current to drain back to the battery.







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Turn on the voltmeter.




How to use a multimeter to test a car battery drain.

How to check car battery with multimeter.
Set voltmeter reading to auto detect or 20 volts.
Use a multimeter and these step by step instructions to perform voltage drop tests to isolate the circuit that is draining your cars battery.




Test it with the multimeter before and after unplugging.
Then touch the battery negative terminal with the black probe from your meter and touch the dirty battery cover with the red probe.
In order to accurately detect the parasitic draw you need to begin with a fully charged battery.




Doing so may blow the multimeters integral fuse or damage the unit.
Many car batteries are 126 volts.
To check whether your battery has reached the leaking point use a multimeter.




Do not allow any object to make contact with both battery terminals or cables at the same time.
Set your voltmeter to a low setting on the voltage scale.
Use a vehicle battery charger to charge the battery to 100.




Some of newer vehicles can be a real pain to diagnose parasitic draw test with a multimeter due to all the added electrical circuits computers and control modules.
Check for battery drain.
Set the dial to 20 which will allow you to accurately measure between 0 20 volts.




Start by removing the negative side battery cable from your car battery this is the black one.
Parasitic draw test on newer cars.
You can do this by checking the owners manual of your device.




Touch the red probe to the positive terminal and the black probe to the negative terminal.
Load test a car battery using a multimeter connect the multimeter probes to the car battery.
You can check the power with a multimeter to ensure the battery is fully charged.




Do not use the 10a connector on the multimeter to measure voltage.
The first test with your multimeter will measure dc voltage indicated with a solid line and a dashed line above a letter v.
Select the appropriate function on your multimeter.




Note battery voltage with the engine off.
Includes troubleshooting tips and advice for all.
To do a quick alternator drain power check using your digital multimeter go to the section bad alternator diode test below.




Pop the hood and locate your vehicles battery.
Then if your alternator passes the test do a battery check using a hydrometer tool as described in the car battery hydrometer test section.
Remove all jewelry before touching the battery terminals or cables.




Connect the black wire from your multimeter to the port listed as com connect the red wire to the 10a20a input port on your multimeter.







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