Image Of How to test and find a parasitic battery drain key off. One of the diodes may have shorted out and caused current to drain back to the battery.
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Touch the red probe to the positive terminal and the black probe to the negative terminal.
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Battery draw test with multimeter.
Then if your alternator passes the test do a battery check using a hydrometer tool as described in the car battery hydrometer test section.
Turn the car off.
Set the dial to 20 which will allow you to accurately measure between 0 20 volts.
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Many car batteries are 126 volts.
Select the dc volts position on your multimeter or the 12v setting if you have a dedicated car battery test range.
Dc voltage is usually marked as a v followed by a short line with a dotted line beneath it.
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Parasitic draw test on newer cars.
Use a vehicle battery charger to charge the battery to 100.
To do a quick alternator drain power check using your digital multimeter go to the section bad alternator diode test below.
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Always plug the multimeter leads back to volts when you have finished testing to avoid blowing the fuse next time you use your multimeter.
Set your multimeter to measure amps each multimeter can be different so youll have to check your instructional manual to determine which setting to use.
A multimeter set on current is a very low resistance almost a short circuit and will draw as much current as your battery will supply till something melts.
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Use a multimeter and these step by step instructions to perform voltage drop tests to isolate the circuit that is draining your cars.
You can check the power with a multimeter to ensure the battery is fully charged.
Step 2 place the red multimeter lead on the red positive battery terminal and the black multimeter lead on the black negative battery terminal.
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Test it with the multimeter before and after unplugging.
Wait for the results of the test on your multimeters screen.
If the car is running when the battery is tested with a multimeter the charge from the powered alternator will skew proper readings.
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How to check car battery with multimeter the first test with your multimeter will measure dc voltage indicated with a solid line and a dashed line above a letter v.
With the black cord from your multimeter place the metallic prong on the negativeblack battery output.
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.
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Set multimeter ensure the ignition lights and radio are off.
If your battery is old or damaged or isnt reading 126 volts when fully charged you may want to replace it before moving on.
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