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have a load test performed on the battery. sometimes they will show 12 volts and still discharge. otherwise you are going to have to find where power is getting to ground or what is using power while the ignition is off. first place to go would be any aftermarket add ons like stereos or amps, then with the ignition off check for open circuits at the fuse block, the only ones that should have power are dome lights and outside lights.

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Q: On a 1994 Isuzs Rodeo replace alternator and belt checked battery still discharges helpWhat else do I check?
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