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96 K1500 4x4 circuit

Hey folks,

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?

Thanks, Dan.

Reply to
Dan
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There's a lot of discussion on this NG about the dash switch and issues with them. Have you checked to see that there is current leaving the switch when you push the 4 wheel HI or LOW button?

Brian

Reply to
el Diablo

Hey Brian,

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.

Thanks, Dan.

Reply to
Dan

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

Reply to
Jeremy Bomkamp

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