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2001 GMC C1500 ignition switch

Tiny
EJ_TYLER
  • MEMBER
  • 2001 GMC C1500
Drive Train Axles Bearings problem
2001 GMC C1500 V8 Two Wheel Drive Automatic

my yukon would not start when I went to start it I would not do anything wouldn't even show any voltage so I thought it was my alternator I had that tested it was good then I noticed that the big bus fuse was burnt so I changed it then I tried to start it again and it burnt the new one what could be the problem
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Thursday, September 3rd, 2009 AT 7:19 PM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I'd make sure the battery has a full charge and the connections are good. Did you have the alternator tested off the vehicle? If so, the alternator itself could be ok and the wiring system to or from the alternator could be faulty? Can you be more specific about which fuse has a problem? If the dash lites won't even come on, I'd check feed to and from the ignition switch.
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Friday, September 4th, 2009 AT 9:34 AM
Tiny
EJ_TYLER
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I had the alternaror checked and lights all come on all the gagues work but when I turn the key foward it burns the big 40 amp fuse under the hood that says ignition its a bus fuse but its the big one
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Monday, September 7th, 2009 AT 10:40 PM
Tiny
JDL
  • MECHANIC
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Pull the starter relay and see if it still blows?
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Tuesday, September 8th, 2009 AT 8:49 AM
Tiny
EJ_TYLER
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  • 4 POSTS
To see if the ignition bus fuse blows is that what u saying
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Tuesday, September 8th, 2009 AT 8:53 AM
Tiny
JDL
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Yes, pull the starter relay, then see if the ign fuse still blows.
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Tuesday, September 8th, 2009 AT 9:40 AM
Tiny
EJ_TYLER
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No it did not blow the fuse
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Tuesday, September 8th, 2009 AT 9:55 AM
Tiny
JDL
  • MECHANIC
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With the relay removed, use a jumper wire with 30 amp inline fuse between relay socket terminals 30 and 87, see if starter will crank without blowing 30 amp fuse. Make sure the tranny is in park or neutral and the e-brake is set.

There are many circuits that get voltage from that ignition fuse. It's like hunting a needle in a haystack.
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Tuesday, September 8th, 2009 AT 10:46 AM

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