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Truck will not start

Tiny
KCLAYTON
  • MEMBER
  • 1995 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
Vehicle has been running solid for years. Drive it yesterday and parked it just like I always do. Went to start it back up a little while later and it won’t turn over and makes a high pitched tone. Checked all the fuses and cleaned the terminals on my less than a year old battery. Still won’t start.
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Tuesday, July 13th, 2021 AT 11:34 AM

8 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Can you possibly upload a video/audio of the noise you are hearing?
Many time the starter can make a high pitch noise if its not engaging.

Here is a basic engine no start guide might be helpful:

https://www.2carpros.com/articles/car-cranks-but-wont-start
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://youtu.be/dCjmRL3p4Cs

Please let me know if you have any questions.

Thank you.

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Tuesday, July 13th, 2021 AT 2:08 PM
Tiny
KCLAYTON
  • MEMBER
  • 4 POSTS
Turns out the noise is my horn.
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Tuesday, July 13th, 2021 AT 2:14 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Does the starter 'clicks' or makes any noise when you turn the key?

https://www.2carpros.com/articles/how-a-starter-and-solenoid-works

If the starter makes a noise then it could be a bad solenoid.
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Tuesday, July 13th, 2021 AT 2:16 PM
Tiny
KCLAYTON
  • MEMBER
  • 4 POSTS
No. When I turn the key the noise that it makes is coming from the horn.
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Tuesday, July 13th, 2021 AT 2:17 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
If you try to jump start the truck does the horn still goes off? Sometimes low voltage could make the electrical components act strangely. Let me know please.
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Friday, July 16th, 2021 AT 9:44 AM
Tiny
KCLAYTON
  • MEMBER
  • 4 POSTS
We’ve narrowed it down to a dead short. Still haven’t found it. Removed the horn relay and the horn fuse and the horn would still make noise. It’s back feeding through the ground somehow.
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Friday, July 16th, 2021 AT 10:08 AM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

I have attached the wiring diagrams for the horn as well as few other diagnostics tips.

Any questions please let me know.

Thanks.
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Friday, July 16th, 2021 AT 10:20 AM
Tiny
KCLAYTON
  • MEMBER
  • 4 POSTS
The horn isn’t the problem. It’s a by product of the problem.
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Friday, July 16th, 2021 AT 10:28 AM

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