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Intermittently losing power

Tiny
JAYB85
  • MEMBER
  • 2003 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 146,831 MILES
My car listed above is the GT model. It has been intermittently losing all power. I have tested my battery and my alternator and starter on a bench tester and a hand held. While still on the car voltage readings are fine. My computer has wiped all codes from its memory, but I do not have any electrical power. I have used every resource I could to find the problem. I have cleaned all my connection and replaced my ignition lock cylinder. Still the same issue. Does anyone have any suggestions?
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Wednesday, July 4th, 2018 AT 6:08 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,432 POSTS
This is common when the positive battery cable goes bad. Here it a diagram to show you how to replace the cable. Make sure the terminals are clean.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Thursday, July 5th, 2018 AT 12:58 PM

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