ECM

Asked by Doug May 08, 2019 at 12:05 PM about the 1999 Pontiac Firebird Trans Am Convertible

Question type: Maintenance & Repair

Car wont charge battery...ECM???....alternator and battery are new and have
been tested

1 Answer
2,600

Sirkut_Interrupted answered 5 years ago

With the car running take a voltage measurement of the red L circuit wire on the alternator... you should see battery voltage coming from the pcm.. if not that doeant mean the pcm is faulty, you need to test for voltage at the pcm itself.. if you have no voltage to the L circuit u can also jump it from battery positive and the alternator should kick on

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