wiring problem 1989 f150
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New User
Joined: Jan 2006
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wiring problem 1989 f150
When parking lights are on, brake lights on also, or when I brake the parking lights, dash lights ,etc are activated. Turning on signal indicator, dash lights, etc also flash. Replaced headlight switch, no change. Wired light grounds directly to bat neg, no change. Disconnected dimmer switch, no change. Any help would be appreciated. BTW called Ford svc dept, explained problem was told the mech's had no idea what problem was.
Junior User
Joined: Feb 2002
Posts: 74
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From: YALE U.S.A.
Im thinking you have a wire somewhere in the harness that is stripped making contact with each other thats why both are on with running lights and both light up when you apply brakes. check where they go through holes that could of chamfed them. Other than that I dont know.
FTE Legend
Joined: May 2008
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From: In my own world
at some point in it's life, someone has hooked up trailer lights. they have shorted out, because they are corroded. look under the bumper, and in that area, any wireing that is not factory, remove it, and your problem is solved. I have run into this so many times, as soon as someone says the dash lights come on when I brake, that's the first place I look
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