Does anyone know of a source for wiring diagrams for the 4x4 control
circuit in a '96 K1500 silverado? I have the classic problem of not
getting any front axle engagement when I push the little button on my
dash. I've replaced the Actuator on the basis of every source saying
that was the 99.9999% most likely problem. At one time I found a web
site (or discussion board) that mentioned some form of diags but can't
find it again. I have the Haynes manual and it's particularly worthless
in this area. I can't believe that power goes through the dash board
switch direct to both the transfer case and the front axle, there has
got to be a relay somewhere. Any one know where?
I'm pretty sure that I have power to the switch. I get the telltale
clunk from the transfer case switching, and I get the indicator light
blinking (the "I'm trying to switch, but I just can't do it"). I'm
thinking that the relay has two sides/poles one for the transfer case
and one for the front axle, but I'm not sure. That said, I can't even
find a relay mentioned in the circuit diagrams I have.
First check the 4x4 fuse in the interior fuse panel, the TCase fuse should
be good if you hear it clunk. If the 4x4 fuse is good, then check for power
at the front axle actuator plug(I think the lt blue wire should show 12v
when ignition switch is on and a 4 wheel drive mode is selected). If you
dont have power there, check at the tcase switch. The tcase switch is
located above the front output shaft(drive shaft) and has a brown wire, a lt
blue wire, and a grey/black(dont' mess with the grey/black it goes to the
pcm) wire. The brown wire gets power from the 4x4 fuse and should be
hot(12v) any time the ignition switch is on and the lt blue should be hot
with the ignition switch on and in 4x4 mode
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