PINPOINT TEST N : One Or More Stoplamps Are Inoperative

N1 DETERMINE THE INOPERATIVE STOPLAMP

Are all the stoplamps inoperative?

Yes	GO to Pinpoint Test M .
No	For the high mounted stoplamp, GO to N2. For a rear stoplamp, GO to N4.

N2 CHECK THE HIGH MOUNTED STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

While applying the brake pedal, measure:

Positive Lead	Measurement / Action	Negative Lead
C475-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to N3.
No	REPAIR the circuit.

N3 CHECK THE HIGH MOUNTED STOPLAMP GROUND CIRCUIT FOR AN OPEN

While applying the brake pedal, measure:

Positive Lead	Measurement / Action	Negative Lead
C475-1	Courtesy of FORD MOTOR COMPANY	C475-2

Is the voltage greater than 11 volts?

Yes	INSTALL a new high mounted stoplamp. Refer to High Mounted Stoplamp .
No	REPAIR the circuit.

N4 CHECK THE REAR LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

While applying the brake pedal, measure:

Positive Lead	Measurement / Action	Negative Lead
Rear Lamp-Left C414-5	Courtesy of FORD MOTOR COMPANY	Ground
Rear Lamp-Right C417-5	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to N5.
No	REPAIR the circuit.

N5 CHECK THE REAR LAMP ASSEMBLY GROUND CIRCUIT FOR AN OPEN

While applying the brake pedal, measure:

Positive Lead	Measurement / Action	Negative Lead
Rear Lamp-Left C414-5	Courtesy of FORD MOTOR COMPANY	Rear Lamp-Left C414-1
Rear Lamp-Right C417-5	Courtesy of FORD MOTOR COMPANY	Rear Lamp-Right C417-1

Is the voltage greater than 11 volts?

Yes	GO to N6.
No	REPAIR the circuit.

N6 CHECK THE REAR LAMP ASSEMBLY JUMPER HARNESS

Is the rear lamp jumper harness OK?

Yes	INSTALL a new rear lamp assembly. Refer to Rear Lamp Assembly .
No	REPAIR or INSTALL a new rear lamp jumper harness.