Defoggers - Rear Window: Testing: Relay/Timer

NOTE: Control switch and timer/relay are mounted to climate control head on dashboard.

1. Ground pin 4 and connect a jumper wire between pins 1 and 3. Connect a 12 volt test light between pin 2 and ground.
2. Apply power to pin 3. Test light should not light. Turn switch on. Test light should come on and stay on after switch returns to "NORMAL" position.
3. Test light should go off under the following conditions: If lever is moved to "OFF"; if power to ignition switch terminal is removed; if 10 minutes have elapsed.

Fig 1: Pin Positions on Timer/Relay

Courtesy of FORD MOTOR CO.