Mark VII V8-302 5.0L VIN F FI (1987)
FIGURE 1 - Wiring Diagram, Heated Rear Window
TESTING
Control Assembly Tests
1.
Ground pin 2 and connect a jumper wire between pins 4 and 3. Connect a 12-volt test lamp between pin 1 and ground (Fig. 1).
2.
Apply power to pin 4. The test lamp should not light.
3.
Momentarily actuate the lever to the ON position. The test lamp should come on and stay on after the lever returns to the normal position.
4.
Test lamp should go off under any one or more of the following conditions:
^
If lever is moved to the OFF position.
^
Jumper wire between pins 3 and 4 is removed.
1987 Lincoln Town Car - Ford (Crown Victoria) - Mercury (Grand Marquis)
36-86-2
Window, Rear-Defroster
36-86-2
^
Approximately ten minutes has elapsed.
Grid Wire Test
1.
Using a strong lamp inside the vehicle, visually inspect the wire grid from the outside. A broken grid wire will appear as a brown spot.
2.
Run the engine at idle. Set the control switch to ON. The indicator lamp should come on.
3.
Working inside the vehicle with a 12-volt DC voltmeter, contact the broad red-brown strips on the rear window (positive lead to battery side and
negative lead to ground side). The meter should read 10-13 volts. A lower voltage reading indicates a loose ground wire (pigtail) connection at the
ground side of the glass.
4.
Contact a good ground point with the negative lead of the meter. The voltage reading should not change.
5.
With the negative lead of the meter grounded, touch each grid line of the heated rear window at its midpoint with the positive lead. A reading of
approximately 6 volts indicates that the line is good. A reading of 0 volts indicates that the line is broken between the midpoint and the B+ side of
the grid line. A reading of 12-volts indicates that the circuit is broken between the midpoint of the grid line and ground.
