1999 GMC Sierra Question

1999 GMC SIERRA
140,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
TODD4123
  • MEMBER
  • 2 POSTS
We put the truck in reverse and all the warning lights on the dash came on. The truck stayed running however the idle would slow down and the lights would go dim. The volt meter would drop down to 9amps and then go back up. The time on the radio reset it self. At one point the engine stoped. It does not happen all the time. Does this sound like the alternator?
Jan 23, 2010 at 9:29 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
MMPRINCE4000
  • CAR REPAIR CONTRIBUTOR
  • 8,548 POSTS
Alternator is a possibility.

Take truck to any autoparts store and have charging system tested, battery, alternator, starter draw.

This will tell you if alt. is problem.

If this happens only when in gear, then you may have a bad motor mount causing excessive engine movement and possibly pulling on a wire harness to the point that it is causing the circuit to be opened.
Jan 23, 2010 at 10:13 AM
Advertisement