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Headlight Switch

Remove headlight switch. Check continuity between appropriate terminals with headlight switch in appropriate position. See HEADLIGHT SWITCH CONTINUITY  table. See Fig 1 . If continuity is not as specified, replace headlight switch.

HEADLIGHT SWITCH CONTINUITY

Switch Position Measure Between Terminals Continuity
Headlight Circuit
Off B1 & H No
Park B1 & H No
Head B1 & H Yes
Parking Light Circuit
Off B2 & R No
Park B2 & R Yes
Head B2 & R Yes
Interior Light On
Off D1 & D2 No
On D1 & D2 Yes
Dimmer Circuit I & R (1)
(1) Rotating thumbwheel from left to right should show a smoothly increasing resistance.
Fig 1: Identifying Headlight Switch Terminals
G99A08204Courtesy of FORD MOTOR CO.