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2000 GMC Sierra Truck doesn't start periodically.

Tiny
DLINEEN
  • MEMBER
  • 2000 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 76,691 MILES
My truck died one day and we found the electrical harness came loose from the front cowling and shorted on the alternator. I have replaced the alternator, battery (because it melted), and the starter twice. They are AC Delco starters. I have also replaced the starter relay. The volt meter has always been a little low (12-13) since the "incident". This morning the truck would not crank. Good battery, lights, etc. But nothing when I turned the key. Got home tonight and nothing again. I went on-line to your site, gave a donation, went back out to check the mileage for registration, tried the key just for laughs, and it started! Not the knock down power you would expect from a 7.4L big block GM but it cranked just the same. What's up?
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Tuesday, January 22nd, 2008 AT 6:17 PM

1 Reply

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Double check the connections at the starter relay, sometimes they are a little loose causing intermittent connections, I use a pick and pry them together a little to make sure there is a good connection. Also when this happens again check for voltage at the ground terminal of the relay, these trucks have a common problem of losing this ground. Then check back with us.
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Tuesday, January 22nd, 2008 AT 6:22 PM

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