Question about 1988 Ford F 150
I'd have to check the stop lamp switch. It should be activated by the brake pedal arm. W/o being able to look at your vehicle at your vehicle, I can't tell you how to get at it? The lite green wire in diagram should not be hot unless you press the brake pedal. If you lift up on brake pedal does the brake lamp go out? If it does go out, maybe you can adjust brake switch, possible problem with brake switch or connector?
The voltage for brakes is wired through multifunction switch, that is something else to check. At the rear, your brake lamps and turn signal use the same bulb filament, just not at the same time.
Posted on Dec 05, 2016
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Posted on Jan 02, 2017
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