Reach up behind the blower box near the firewall on the passenger side in the cab and you will feel a 3 prong connector mounted on the back of the box for the resister assembly. Pull the wire connector socket forward and it will come off the prongs of the resister. It is the connector to the switch on one end and the resister on the other. If you have trouble finding it, just follow by feel the wires on the dash switch toward the passenger side. It is held in place by 2 screws which you can remove with a 1/4 inch drive ratchet. I dont clearly remenber what size socket, but I think it's a 5/16. Before replacing the old resister use a grounded test light to check for power at spade sockets in the connector. You should have power at only 1 wire at a time depending what position the knob is in. If you don't have power at all switch positions the switch is probably at fault. You can also use an ohm meter to check continuity between the ends of the connector loom by disconnecting both ends and using the "sound tone" feature on your multimeter.
Last edited by Xena; 02/19/2021 7:20 PM.
