Battery light won’t go out

Larry614
Posts: 1
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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carriedi
Posts: 2459
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

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.
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2000 silverado 4.3 alt.jpg

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