Pinpoint Test E: One High Beam Headlamp Is Inoperative

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

E1 CHECK THE VOLTAGE TO THE INOPERATIVE HEADLAMP BULB

Key in OFF position.
Place the headlamp switch in the headlamps ON position.
Place the multifunction switch in the high beam position.
Disconnect: Inoperative Headlamp.

Measure the voltage between the inoperative headlamp, harness side and ground as follows:

LAMP CONNECTOR-PIN CIRCUIT DESCRIPTION

Vehicle	Lamp Connector-Pin	Circuit
Mountaineer	LH C1021-1	12 (LG/BK)
Mountaineer	RH C1041-1	12 (LG/BK)
Explorer	LH C1020-1	12 (LG/BK)
Explorer	RH C1040-1	12 (LG/BK)

Fig 1: Checking Voltage To Inoperative Headlamp Bulb

Courtesy of FORD MOTOR CO.

Is the voltage greater than 10 volts?

Yes

REPAIR circuit 1205 (BK). TEST the system for normal operation.

REPAIR circuit 12 (LG/BK). TEST the system for normal operation.