Electric actuator on 93 GMC front axle does not engage in 4WD

Tiny
VACERO
  • 1993 GMC SIERRA
  • 280,000 MILES

I just recently lost 4wd on my 93 Gmc 4x4. I checked it out and adjusted linkage etc, checked wiring for breaks as best I could, found no power to electric actuator on front axle. Checked fuse-ok. The transfer case does engage when I manually select 4wd as the front drive shaft locks in.I am wondering if one of 2 sensors I see on the transfer case transfer power to the front axle when I select 4wd is faulty and how would I check them?

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Sunday, October 9th, 2011 AT 2:04 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,399 POSTS

Yes, power comes from a relay. I have attached a wiring schematic for the transfer case. It should help. Let me know if you have questions.

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Sunday, October 9th, 2011 AT 7:24 PM

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