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Old 05-18-2009, 04:51 PM
72Blazerod 72Blazerod is offline
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1978 F350 Tail light wiring diagram?

Hi Guys,

I am having brake light troubles. Out back on the passenger side my tail light is acting funny. When I turn my lights on, the passenger side is very dim. It is also dim when I turn my right signal on. When I hit the brakes (with the lights off) it comes on also very dim. When I hit the brakes with the headlights on, the light doesn't come on at all. I took at look at the bulb socket and it seems ok, but only the 'headlight" filament would come on at all, the brighter brake light filament doesn't come on at ever. I a trailer light connection wired on last year and my tail lights have been acting funny ever since.

So, to finally cut to the chase, does anybody have a color coded wiring diagram of the tail lights for a 1978 (F350, if this matters). I'd really like to get my lights working properly.

Thanks,

Rod
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Old 05-18-2009, 05:39 PM
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joshjones.thewelder
Red/ Black = back-up lights
Yellow/ Black = Left/ Stop
Green = Right/ Stop
Brown = Running/ Tail Lights

Also check your grounds, could be corroded or loose.

Josh
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Old 05-18-2009, 10:10 PM
81-F-150-Explorer 81-F-150-Explorer is offline
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Check the trailer wiring connections.

If it started when you had trailing wires put in, then it's more than likely this is where the problem lies.
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Old 05-19-2009, 01:44 AM
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Sounds like a ground problem. Anytime one light dims or goes out when another light powered from a different circuit goes on, it is almost always a ground problem. The increased current creates a voltage drop across an unwanted resistance in the ground path, often referred to as "ground shift."
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Old 05-19-2009, 01:44 AM
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