How do you test amp loss from car bat with multimeter?

Updated: 4/28/2022
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Lvl 1
13y ago

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Amp loss? Do you mean that something is draining your battery when your car is off? If so, try this. First a word of warning, if you have an alarm system, or a code or something that locks your stereo make sure you have what you need to unlock it before disconnecting the battery. Ok, now remove the *negative* battery terminal and set your multimeter to amps, and connect the multimeter between the battery terminal and the battery. If you see a large amount of current (higher than .300 amps or so) then make sure your lamps are all off. (hood/doors included)

When trying to isolate which circuit is causing the trouble, go through your fuse block and retest with each one removed at a time... when the load in amps drops when you remove a fuse, there's the culprit.

If you mean that you want to see if your battery is bad or not, you'll need a load tester... and your basic multimeter won't do that.

buy a new amp meter and read the paper work that comes with it it will tell you what you want to do.

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Q: How do you test amp loss from car bat with multimeter?
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Using a digital multimeter that can measure mA, first disconnect the neg battery cable from the bat then use a jumper wire to reconnect the neg bat cable to the neg bat post. Then set the multimeter to either the 10 amp or the 2 amp mode (start with the 10 amp mode) and connect the leads from the multimeter to the neg bat cable and to the neg bat post. Being sure that all switches and accessories are turned off (doors are closed, under hood light, etc), disconnect the jumper wire from the neg bat post leaving only the multimeter connected. You will now get a reading on the meter that should read under .050 mA. Under .050 mA is desirable. Over .050 mA , look for the cause of that excessive drain on the battery.

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