How to bypass the PCM in order to get your overdrive working. Step 1 locate the plug on the side of the transmission. Step 2 cut the orange wire from the harness. Step 3 splice in a wire on the orange wire and run into the cab on a toggle switch. Step 4 run a ground from the toggle switch. Step 5 give it a test. My truck is a 1993 so it could vary year to year.

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