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1995 GMC Yukon Blown 4WD Fuse

102,000 MILES • V8 • 4WD • AUTOMATIC
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OLDYUKE95
  • MEMBER
  • 2 POSTS
System was working fine, then I attempted to engage the 4WD and nothing happened. I checked and found that the fuse for the 4WD was blown. I replaced it and tried again to engage the system. As soon as the lever was pulled, I could hear the fuse blow. We had recently had a large snowfall, with 2-3 foot drifts crossing some roads. I busted through several of these deep drifts, so I thought that I might have knocked a wire, or damaged a plug. There was no visible damage to any wiring, or the plugs. There is obviously something causing a short, but it seems odd that it would work, then within a matter of hours simply stop. Switch, relay...?? I really don't want to just throw parts at it, anyone ever deal with this before???
Jan 28, 2009 at 4:33 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi:
Unplug the wiring to the 4wd actuator on the transfer case and see if the fuse blows when you turn the switch. If it doesn't, I feel the actuator itself may be the problem.

Let me know what you find.

Joe
Jan 28, 2009 at 9:29 AM
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OLDYUKE95
  • MEMBER
  • 2 POSTS
Disconnected actuator and tested, fuse did not blow. Replaced part and all works fine now.

Thanks!!
Feb 9, 2009 at 1:08 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi:
That is good news. The reason I had you disconnect the actuator it to determine if there was a short before the power got there. I'm glad it's fixed.

Joe
Feb 10, 2009 at 3:43 AM
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