![]() ![]() (If it does, you divide the remaining that was connected. ![]() You remove 1/2 of the car's electrical circuits from being connected to the battery ( remove 1/2 of the vehicles fuses ), and see if the battery goes dead in a few days. If that does not solve the puzzle, another much slower approach that usually does provide an answer is divide and conquer. So, one question is: has the vehicle been used to jump start another vehicle with while its engine was running? If so, then have the alternator output diodes checked for reverse leakage draw that is enough to drain a battery.īTW, I like the Car Wizard video and the Amp Hound. Today with the improved alternators this is an even rarer occurrence. ![]() That would allow the positive output wire of the alternator that connects to the battery to supply that leaky draw with current that would discharge the battery if the car sat for a couple of days without being used. That is, it would allow a small amount of current to flow in the wrong direction. Usually, one of those diodes would fail as being electrically leaky. Decades ago, it use to be that if you jump started a vehicle with a bad battery and ran the engine of the good vehicle while the starter of the bad vehicle cranked, it would draw such a large amount of current from the alternator of the good vehicle that there was a small chance of damaging the output diodes of the alternator of the good vehicle. ![]()
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