1991 GMC Sonoma alternator

Tiny
WILLIAM NELSON
  • MEMBER
  • 1991 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I checked voltage with a volt meter on old alternator and was ngetting around 11.5 volts with truck running. It would stop running after it run a while.I replaced it with an exact rebuilt alternator but is still doing the same thing was wondering what I did wrong? This model doesnt have a voltage regulator does it I coulnt find anthing that looked like one on the firewall. Thanks
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Thursday, February 26th, 2009 AT 1:39 PM

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Tiny
BLUELIGHTNIN6
  • EXPERT
Hello
Thanks for the donation.

Your voltage regulator is built into the alternator itself, so if you have already replaced the alternator then you replaced teh regulator as well. I believe the problem lies somewhere else. Check all earth connections and have the battery heavy discharge tested (Drop tested). Let me know the results and I will follow up.

Thanks for using 2CarPros. Com!
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Thursday, February 26th, 2009 AT 2:05 PM

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