Engine will not crank over and I think the battery is ok

Tiny
23MARK23
  • MEMBER
  • 2002 GMC SIERRA
Starter will not crank on my 2002 GMC Sierra 2500HD. Lots of juice from battery, single click when turned over then nothing. Tried tapping starter with hammer while turning over, Moving lever from park to neutral. Boosted trying to see if lots of juice
Saturday, December 3rd, 2011 AT 8:51 PM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a hleper try to start it and you go under truck and hit side of starter with hammer. If it starts your starter is bad. Also check to make sure the starter is getting good power.
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Saturday, December 3rd, 2011 AT 9:21 PM
Tiny
23MARK23
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  • 3 POSTS
Sorry forgot to add.
Tryed
- Hitting starter with hammer while turning over.
- Fuses are ok
- Wiggling shifter (park and neutral)
- Battery has lots of juice and lights all working bright
- Placed screw driver across power terminals of starter and it works but still no start even with helper turning key

bad solenoid or wiring im guessing? Unless computer problem?
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Sunday, December 4th, 2011 AT 2:22 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If it cranks by jumping it with a screwdriver then it's eitehr our ignition switch or your starter relay in your underhood fusebox. Or the pcm isn't sending a signal to the relay to start the truck.
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Sunday, December 4th, 2011 AT 2:34 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
Check for a signal to crank from the ignition switch at the stater solonoid. And if it doesn't start using the hammer trick, the starter could still be bad.
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Sunday, December 4th, 2011 AT 2:42 AM
Tiny
23MARK23
  • MEMBER
  • 3 POSTS
I did pull the relay out and removed the relay for the lights being there the same one, tried it there and it works. This was in a parking lot with little tools haha, I have towed it to a shop now to get it looked at monday morning. Just so I have an idea and don't get crooked were would the ignition switch be and how would you go about diagnosing it? I like to be some what educated and learning from experiences like these. Thanks for the help also, appreciated.
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Sunday, December 4th, 2011 AT 2:46 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There are 3 fuses ofr this. The relay for the lights is not the same one as the starter relay. This shold be clearly marked on the underside of the fuse box. There is a crank fuse in the fuse panel under the dash and 2 fuses int underhood. 1 being an ignitioon fuse of 20 amp and another being a 40 amp (large fuse) if any of thoseare blown it won't start. The ignition switch is mounted ont eh lower part of the steering column. I still think it's a connection/relay/fuse problem especially since you can crank it by jumping at the starter.
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Sunday, December 4th, 2011 AT 2:34 PM

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