Wont keep battery charged

Asked by Guru95KQV8 Jan 12, 2021 at 05:08 PM

Question type: Maintenance & Repair

If my altenator is charging good. Why wont it
charge the battery.  Also if i leave cables
hooked over night it kills the battery

2 Answers


What is year--make--model? You can use digital multimeter across battery posts, everything off. The generic spec for a full charge is 12.6 volts. If the reading is down very much, use a charger and charge it up. Battery connections all good. The bat terminal at generator, hot all the time, even with key off. Use a digital multimeter or test light to check for voltage? If nothing there, have to check that wiring circuit. Usually the generator needs excite voltage or it won't charge. i can't look up your charging system wiring diagram w/o year--make--model? My database only covers vehicles in the US.

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