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Headlight Switch Test

Remove headlight switch. See HEADLIGHT SWITCH under REMOVAL & INSTALLATION. Test headlight switch for continuity between specified terminals at each switch position. See LIGHT SWITCH CONTINUITY table. See Fig 1 . Replace headlight switch if continuity is not as specified.

LIGHT SWITCH CONTINUITY

Terminal Pair Condition
Switch In OFF Position
B-H No Continuity
R-P No Continuity
Switch In PARK Position
B-H No Continuity
R-P Continuity
D1-D2 (1)
P-I (2)
Switch In HEADLIGHTS Position
B-H No Continuity
R-P No Continuity
D1-D2 (1)
P-I (2)
(1) Continuity should exist with thumbwheel in detent position; continuity should not exist with thumbwheel not in detent position.
(2) Resistance should increase and decrease smoothly as thumb-wheel is rotated.
Fig 1: Identifying Headlight Switch Terminals (Mustang)
G94J33125Courtesy of FORD MOTOR CO.
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