J.W. Kiser

I recently purchased an 86 928 and have started going through the items that need repaired, one of which was the passenger seat switch. The seat switches all worked excluding the forward and backwards function of the seat base. I started by removing the switch to clean as I had seen on a few posts. When I removed the seat switch cover I noticed someone had already put in a newer switch; however, the opted to just cut the wires from the new switch and splice them in. I still moved forward with taking the switch apart and cleaning all contact points with electrical cleaner and q tips. When I reassembled I still had the same proble, no forward and backward. Any thoughts?

I would like to meter the wires to see if the switch is actually functioning for the forward and backwards, but can’t figure out how. Second, I thought it maybe a bad motor. Does anyone know if the forward/ back motor is independent?

nosnow

The motors are independent, if memory serves me correct, but I have never heard of a motor going bad. You may want to take the seat out and see what is going on. There is a tool in the tool tray that fits into the hole in the front of the seat motor housing that will allow you to manually crank the seat for and aft.

Wisconsin Joe

You can take the plastic trim piece off and look under the seat. There are three motors. The one in the center is forward/back. You can put power to the connections and see what happens. Polarity one way makes it go forward, the other way back.
You can also check for power/ground to see if the switch is working. Like the motor operation, switch one way will give power on one wire and ground on the other, switch the other way will reverse it.

For working on the seat motors and wiring, it's a lot easier if the seat is out. But you have to run the seat all the way up to get to the back bolts and all the way back to get to the fronts. Doing it manually is really slow.