Battery light won’t go out

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Joined: Wed Oct 27, 2021 6:39 pm

Battery light won’t go out

Unread post by Larry614 » Wed Oct 27, 2021 6:59 pm

I have a 2000 Chevy Silverado 4.3L V6. My Battery light came on & then would go out every time I drove it then it came on & never extinguished. I got it checked & it was a voltage regulator bad. I bought a new alt & recharged my battery. Cranked it up Battery light came on went out like it’s supposed to but then It came back on & stayed on. Anyone have any solutions to this problem? Also replaced serpentine belt.

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Re: Battery light won’t go out

Unread post by carriedi » Thu Oct 28, 2021 4:41 am

who diagnosed the regulator? What did they use to diagnose it? On a 2000 silverado it should be PCM controlled.

here is a wiring diagram for that year:

you should use a scanner and check to see what the computer is reading. Is the PCM seeing a charging voltage? Is it sending a duty cycle signal to the alternator? Is the signal for the light on the dash getting the correct signal? You may have to scan the instrument cluster too.
2000 silverado 4.3 alt.jpg

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