2000 GMC Sierra - Erratic loss of electrical power

2000 GMC SIERRA
75,000 MILES • V8 • 2WD • AUTOMATIC
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SLOANE
  • MEMBER
  • 1 POST
During the past week, I've noticed electrical power being lost completely and regained quickly at different times while driving. This mostly happens right after start up, or on bumpy roads. What happens is the ignition panel warning lights come on, radio cuts out, engine begins to die, ignition chime sounds, etc., as if battery connnection was lost and regained very quickly. I've checked that (with truck running) and connections are fine, along with other electrical box connections under the hood. Truck runs great other than this. What could be the problem? Computer? Ignition switch? How to troubleshoot?

Many thanks!
Jan 9, 2008 at 2:04 PM
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MASTERTECHTIM
  • ✓ASE Certified Mechanic
  • 4,750 POSTS
  • ASE Certified Mechanic
It sounds like the battery has an internal short which can happen, I would remove the battery and get a new one to fix the problem. Also the positive battery cable can look good but internally it is bad as well, so if the new battery doesn't fix it do the cable or do them both to be safe.
Jan 9, 2008 at 2:19 PM
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