brake light
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Senior User
Joined: Feb 2010
Posts: 407
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From: Colorado
brake light
Im having a problem with my driver-side brake light/blinker is works some times and not others (obviously terrible 40 year old wiring issues) so my question is where in the wire circuit would cause this problem? from the tail lights to the cab all the wiring looks just fine (thinking its under the dash somewhere. does anyone have a wire diagram?
Junior User
Joined: Jun 2012
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Check this site out.. should get you where you need to go...
Ford Truck Technical Drawings and Schematics - Section H - Wiring Diagrams
Ford Truck Technical Drawings and Schematics - Section H - Wiring Diagrams
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Does the running light work fine? Then the socket is grounding okay.
Does the brake light work and not the TS? Vise versa? Or both?
The brake light and turn signal function from the same bulb element, thus the same wire coming from the turn signal switch. I'm guessing that might be the problem. Try this: have someone wiggle the turn signal switch around as you watch the rear tail light. Does it sometimes work? I'm thinking the contacts might be bad and thus making it work erradic.
Does the brake light work and not the TS? Vise versa? Or both?
The brake light and turn signal function from the same bulb element, thus the same wire coming from the turn signal switch. I'm guessing that might be the problem. Try this: have someone wiggle the turn signal switch around as you watch the rear tail light. Does it sometimes work? I'm thinking the contacts might be bad and thus making it work erradic.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
I agree, sounds like a grounding issue. I would start at the light, clean & scrape all points of contact. Trailer wiring gets added in along the way, tape looses it's grip. Bet it's something simple.
John
John
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Katt
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Feb 20, 2000 07:02 PM
