[bdahl385]

okay, that helps. I would start with the simple things first, you need to verify that the switch itself and wiring is okay. I don't have a wiring diagram but you would need to find where the two wires from the o/d switch terminate and then use an ohmmeter to check that the switch works. I would think the wires would terminate into the PCM assy. to tell the computer you want to engage or release o/d. Hopefully someone with electrical diagrams can get you pointed in the right direction here.

Curious, did this fail recently and suddenly or what's the history of whether the o/d switch ever worked as it should...