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Electrical issue

Tiny
DRIVER3901
  • MEMBER
  • 1985 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 213,000 MILES
I have a 1985 GMC 1/2 ton and when you turn on the heater/blower motor on high, within 2 mins the trucks gauges/lights/headlights/blower motor stop working but the trucks still runs. I recently did an engine swap {305 to a 350} and I used all the original altenater. The truck has a brand new battery aswell. When then gauges stop working sometimes if you open a door or pop the hood it will start working again. My question is where do I start to fix this problem?
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Wednesday, December 8th, 2010 AT 2:51 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I bet you didn't hook up the engine to ground strap that goes from the cylinder head to the body either. Also hook up a battery to body ground strap.
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Wednesday, December 8th, 2010 AT 3:30 PM
Tiny
DRIVER3901
  • MEMBER
  • 2 POSTS
Thank you. I checked and I forgot to hook up the ground strap from the engine to the firewall. The ground to the fender I did remember and so far it seems to be fixed. Thanx again
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Wednesday, December 8th, 2010 AT 6:14 PM

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