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Originally Posted by spinn360
This is WRONG! SORRY
So does anyone have a FSM that would show the wire location? Or am I just going to have to experiment?
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When a rear torque bias signal is sent to Sol C an electrical load is place on a servo that opens a valve.
At 100% load the valve is fully opened, and fluid is allowed into the rear of the transfer case to drive the driveline which actuates the rear diff and wheels.
A failure of Sol C would essentially be a loss of electrical load or signal, hence a loss of it's ability to remain open, thus cutting of the supply of hydraulic fluid from the rear transfer, in effect converting the drivetrain to FWD.
In somewhat random, maybe rare situations the valve or motors controlling the Sol C valve may become sticky, or seize altogether. In this situation a small amount of fluid may be allowed to pass and spontaneously actuate the rear wheels.
*snipoldtext, enter new*
I don't think adding a switch anywhere is going to help you.