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msh · 05-06-14, 01:53 PM

I agree to John - the problem most likely to be with the car, not battery. But care must be taken while measuring that current with multimeter - cheap ones have max current measurement usually 200 mA and is protected by internal fuse, rated @ 0,25A - in case the drain is bigger than this or something creates power consumption pike when battery is connected [like aftermarket alarm that arms and sounds horn at that moment] , that fuse would be blown instantly.

I usually do this test with simple standalone ampermeter, one that is intended to be mounted on some board. Ampermetre with max current between 1A and 5A must be good enough.

Of course, good, expensive multimeters have similar current measurement capabilities.

05-06-14, 01:53 PM	#6
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	I agree to John - the problem most likely to be with the car, not battery. But care must be taken while measuring that current with multimeter - cheap ones have max current measurement usually 200 mA and is protected by internal fuse, rated @ 0,25A - in case the drain is bigger than this or something creates power consumption pike when battery is connected [like aftermarket alarm that arms and sounds horn at that moment] , that fuse would be blown instantly. I usually do this test with simple standalone ampermeter, one that is intended to be mounted on some board. Ampermetre with max current between 1A and 5A must be good enough. Of course, good, expensive multimeters have similar current measurement capabilities.