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Headlight Switch

Disconnect headlight switch harness connector. Measure resistance between specified terminals with switch in appropriate position. See HEADLIGHT SWITCH TEST  table. See Fig 1 . If resistance is not as specified, replace headlight switch.

HEADLIGHT SWITCH TEST

Switch Position Between Terminals No. Ohms
Autolamp
Off 7 & 8 470-490
On 7 & 8 (1) 1000-11,000
Fog Light
Off 7 & 9 0
On 7 & 9 470-490
Headlights
Off 1 & 7 4180
Park 1 & 7 1780
On 1 & 7 780
(1) Resistance should smoothly increase from 1000 to 11,000 ohms as headlight switch is rotated counterclockwise from OFF position toward AUTOLAMP position.
Fig 1: Identifying Headlight Switch Terminals
G00011095Courtesy of FORD MOTOR CO.