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No crank or instrument lights but headlights work?

Tiny
ROBJI
  • MEMBER
  • 1992 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
I have the truck listed above that cut out while driving. At first thought a fuse and checked all under dash and they are all good. Same with junction block under hood getting 12.77 V same as battery there. I was thinking ignition switch but it does not explain why electric door locks don't work either as they are not switchable. Any ideas on what to test would be appreciated.
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Monday, January 9th, 2023 AT 4:18 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like the fusible link down by the starter has let go. Here is a wiring diagram so you can see what I am talking about and the link location as well, to test the link simply pull on it if is it rubbery it is bad.
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Tuesday, January 10th, 2023 AT 10:56 AM
Tiny
ROBJI
  • MEMBER
  • 3 POSTS
Is that not before the power distribution block? I am getting power to all the terminals on it. (It's located in engine compartment left firewall) Did not get a chance today but was going to pierce wires and check for power leading to wires leading to where they enter the cab for fuse box tomorrow.
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Tuesday, January 10th, 2023 AT 6:46 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
You could have an ACC circuit breaker that has gone bad. Here are the wiring diagrams so you can check it out. Check out the images (below). Please let us know what happens.
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Wednesday, January 11th, 2023 AT 11:50 AM
Tiny
ROBJI
  • MEMBER
  • 3 POSTS
Bad wire.
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Saturday, January 14th, 2023 AT 2:03 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Yep, that is a bad fusible link good find. Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Saturday, January 14th, 2023 AT 5:10 PM

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