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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.