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No crank no start, starter wiring diagram needed?

Tiny
JUANH90
  • MEMBER
  • 1995 GMC C1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My truck does not crank. I Put a new starter and still doesn’t crank. The wire going into the starter that is activated by turning the ignition switch does not turn on. (Tested using a test light) could it be a neutral safety position sensor, or a starter relay or fuse?If this truck is even equipped with a starter relay or fuse.
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Tuesday, May 2nd, 2023 AT 8:24 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,057 POSTS
There is no starter relay in this truck the wiring is pretty straight forward.

Here is a guide to help check the wiring and I have included the starter wiring in the images below:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

This guide can help as well:

https://www.2carpros.com/articles/starter-not-working-repair

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Tuesday, May 2nd, 2023 AT 10:20 AM
Tiny
JUANH90
  • MEMBER
  • 7 POSTS
Replaced neutral safety position switch and still no crank, the starter is good, could it be the cable that has the purple wire or anything else that I am missing? Will post videos and pics tomorrow. Thanks
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Thursday, May 4th, 2023 AT 7:16 PM
Tiny
KEN L
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I would test for power at the yellow wire from the ignition switch and then down through the purple wire.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go over this guide and report back. You could have a bad ignition switch
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Friday, May 5th, 2023 AT 10:32 AM
Tiny
JUANH90
  • MEMBER
  • 7 POSTS
I put a new ignition switch on it and it still doesn’t crank when in the start position, When I opened up the bottom part this yellow wire was broken could that have anything do with?
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Saturday, May 6th, 2023 AT 8:54 AM
Tiny
KEN L
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Thanks for the video, it helps. Yes, the yellow wire from the ignition switch goes to the neutral safety switch. You must fix that wire for the starter to work.
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Sunday, May 7th, 2023 AT 10:40 AM
Tiny
JUANH90
  • MEMBER
  • 7 POSTS
Thanks, how can I repair it? Is there a specific part I can find or will I have to fabricate my own wire?
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Sunday, May 7th, 2023 AT 5:11 PM
Tiny
KEN L
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Yes, you will need to repair the wiring and then test for power from the switch through the starter wiring as shown in the wiring diagrams.
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Monday, May 8th, 2023 AT 1:30 PM
Tiny
JUANH90
  • MEMBER
  • 7 POSTS
That yellow wire that is broken is just the airbag wire when it went off. The truck still doesn’t start or crank, replaced Neutral safety switch, replaced ignition switch, tested the starter, all terminals and cables seem to be in good condition. When I put the key in the ignition and turn it, the dash does not light up any of the check engine light, battery light, etc. Could that be the problem, if so, how can I fix it?
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Wednesday, May 10th, 2023 AT 5:21 PM
Tiny
KEN L
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Please check the maxi fuse # 6 under the hood using a test light. Look at the starter and ignition switch wiring diagrams to see how the system gets power and use a test light to see where it loses it.
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Thursday, May 11th, 2023 AT 9:48 AM
Tiny
JUANH90
  • MEMBER
  • 7 POSTS
Replaced the maxi fuse, it was blown and I replaced it and still nothing. How can I test for power at various sources?
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Friday, May 12th, 2023 AT 6:19 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,057 POSTS
Here is a guide to help you test each point to see where it loses it:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go over this guide and get back to us.
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Saturday, May 13th, 2023 AT 10:19 AM

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