why does this car not hold a charge when the altenator and battery are good?

1999 TOYOTA SIENNA
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SHOP.139
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altenator is good and battery is good
Apr 30, 2012 at 6:55 PM
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CARADIODOC
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Something is probably draining the battery when the engine is off. Does the battery charge while the engine is running?
Apr 30, 2012 at 7:00 PM
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SHOP.139
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There is no output from the altenator 12volts running in battery only we've tried 3 altenators and nothing happens altenator fuse 140amps is ok
Apr 30, 2012 at 7:41 PM
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CARADIODOC
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  • ASE Certified Mechanic
Have you measured the voltages on the smaller wires? One has to have voltage to run the internal voltage regulator.
Apr 30, 2012 at 9:29 PM
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