[rlith]

It could be the motors from what you describe. Do you have the lumbar adjustmnt? Does that still work? If not then it could be a bad electrical connector.

One of the major problems in our trucks is that the seat wires runs right under the carpet where our feet go. So the salt and water from the winter soak in and eventually corrode the wires, the weight of our feet grind them down as well.

Remove the seat nuts, tip the seat back. Find an old cigarette lighter plugs (lets say from an old cell phone or something) Cut the end off and splice it to the seat harness (the lubar one, same circuit) and see if the see works then. If so, you know it's bad wiring, if not then you know it's a bad motor.