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1978 F350 Tail light wiring diagram?

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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 03-11-2016, 06:52 PM
Farmboy18 Farmboy18 is offline
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Wiring problem

Hey guys....I have a problem...I bought a 1978 f150 ranger xlt and noticed that the wiring from the instrument cluster to the brake light harness is completely missing......the headlights work and when I turn them on the front side markers come on and front turns as well but when I put turning signal on the won't flash.could that be a bad flasher? And do u know were I can get all the wiring for the back lights? And also the gauge lights don't light up and none of the gauges work except the speedometer....... Do u also know were I can get all of that wiring....... If u can get back to me ide appreciate it.... Thanks
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Old 03-11-2016, 06:58 PM
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Originally Posted by Farmboy18 View Post
Hey guys....I have a problem...I bought a 1978 f150 ranger xlt and noticed that the wiring from the instrument cluster to the brake light harness is completely missing......the headlights work and when I turn them on the front side markers come on and front turns as well but when I put turning signal on the won't flash.could that be a bad flasher? And do u know were I can get all the wiring for the back lights? And also the gauge lights don't light up and none of the gauges work except the speedometer....... Do u also know were I can get all of that wiring....... If u can get back to me ide appreciate it.... Thanks
ZOMBIE THREAD ALERT!!


Yes.

NPD, DC, Mac's, or salvage yard.

Btw, it's not good to revive a SEVEN-YEAR OLD THREAD THAT IS GENERALLY UNRELATED TO YOUR PROBLEM OF MISSING WIRING.
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Old 03-11-2016, 07:10 PM
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All the wiring that goes to the lights in the back and to the gauges are missing is basically wat I'm trying to say just wanted to see if any one knew were I could get that wiring
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Old 03-11-2016, 07:28 PM
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Sorry didn't know I'm new so I don't really know how every thing works yet lol and thanks
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Old 03-11-2016, 07:50 PM
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Go to this post and scroll down to the Vendors section: http://www.ford-trucks.com/forums/11...l#post14955960
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Old 03-11-2016, 08:25 PM
Farmboy18 Farmboy18 is offline
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Thanks man that helped alot.....its gonna cost about 800 Ford all the wiring for entire truck but it's worth it......thanks I appreciate the help
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Old 03-11-2016, 09:26 PM
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Welcome to FTE, its all good. Like beer always ck the born on date and the last post reply, no sence in waking a zombie unless you have a spare body part to feed it. lol

X2 on ck the vendor list and read this for help. http://www.ford-trucks.com/forums/10...ml#post1812190

Turn and Stop Lamp Diagnosis for 70's Ford Pickup - Ford-Trucks.com

Centech Wire Custom Wiring Harnesses

Painless Performance

Hit the JY for a pieces of a way cheaper replacement harness.
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