Mechanics

4X4 NOT WORKING

1988 GMC Sierra

Electrical problem
1988 GMC Sierra V8 Four Wheel Drive Automatic 300k miles

when I shift into 4x4, the fuse for 4x4 and the heater blow. Where would you start looking for a short
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Glennkiley
December 18, 2007.



Its a problem with the activation switch mounted in the front differental or one of the wires that go to it

Tiny
Greasy
Jan 2, 2008.