Alternator problems
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From: Gig Harbor, Wa
Alternator problems I had the car die on me a while back then went to restart and the battery was completely dead. I put in a fresh battery and checked the output of the alternator. I was getting around 3 volts on the alternator terminal. I figured this was bad and installed a new alternator. Now with the new one in place, I am still getting around 3 volts. This is a 99 F-body alternator, engine and computer.
Any suggestions?
Any suggestions?
Thread Starter
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From: Gig Harbor, Wa
Originally Posted by hourang
is that lil red wire hooked up?
With the output wire disconnected, I get 12 volts on the wire leading to the battery. With the wire attached and the engine running, I am getting the 3 volts. This tells me the alternator is putting out -9v. Could this be a problem with the rectifier diodes in the alternator or the wire coming from the PCM? As I understand the "regulator" is the PCM sensing the output voltage and sending a control signal via the little red wire back to the alternator. When I get home tonight, I am going to check for continuity between the PCM and the plug on the alternator.
