Sticking light switch, maybe? Check for light in trunk, hood, glove box after
dark, without opening any of them. Some of the output machine checkers (or their
operators) lie; install a voltmeter gauge to see what the the voltage is going
down the road. It should be 13.5~14.5 volts; below 13.5, the battery really
takes a long time to re-charge, and at 13.2 volts, it's just staying even. Above
15 volts, it's a runaway alternator that's burning out the battery.
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