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Car: 2003 Honda Civic Si G1Wh dash cam, 400w amp, 4300k HIDs

My alternator failed badly (stereo cutting off), no battery light. Replaced it with a reman Duralast, battery light is on. It shows 14.5v while running, and I've had the battery tested at 2 different stores, both good. The car has only died once in 3 months (I leave my dash cam on overnight sometimes). The car has an electrical load detector, but there is no CEL indicating a problem with it. Fuses good, grounds good, alternator connection good. Cruise control doesn't work, and just threw a TPS code, not sure if that's related. What gives?

Coletrane
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1 Answers1

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Check the voltage of the white/blue wire at the alternator connector. It should be at least 12 volts if the alternator charging voltage is greater than 13 volts. If there is no voltage here then the regulator in the alternator is no good.

This signal goes first to the PCM then to the multiplex control unit and then to the instrument cluster. Testing it after it leaves the alternator is challenging, Honda gives no test procedure for this.

Fred Wilson
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