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Generation 6 1973-1979 F100, F150, F250, F350


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  #1  
Old 11-09-2009, 06:18 AM
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tail light wiring.

Hey, can someone help me undrstand tail lighting. The right rear light blinks but is very dull and no park or brake. The bulb is fine. All other lights work.
Im not understanding how to fix it. There are two wires to the light. But it has 3 functions, right. I can start stripping tape to find a problem or run new wires. Or could it be the relay? Are those wires connected to other lights or do they run seperate. As you can see I dont know squat. Can I tie into the left rear with new wires for the park and brake? Argggg.
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  #2  
Old 11-09-2009, 06:23 AM
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Sounds from the description of what you are saying is that you have a Ground issue.
Check all the grounding points on the lighting circuit. Pull the connections apart and clean the ones in the harness where it unhooks at the bumper.
Most lighting issues are from poor connections.
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  #3  
Old 11-09-2009, 06:26 AM
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Ok, so, where is it grounded? There is two wires to each light and I dont think one is a ground. Wouldnt the light be grounded by the frame or is the another place a wire will go to be grounded?
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Old 11-09-2009, 06:37 AM
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If this is the flat bed it is hard to tell where they grounded this. On a normal bed in a 70 series truck there is a small wire that is attached to the bed by each tail light.
Do you know if it still has the original harness on it?
If so I can get you a wiring diagram with color codes.
Try testing the lights with a test light along the a harness to see where the problem starts and work back from that point to find the bad spot.
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Old 11-09-2009, 07:02 AM
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The two wires supply power to two different filaments in the bulb.
one wire is for running lights (you called it park)
The other supplies power when brakes are applied or turn signal is turned on, If the brakes are applied while the turn signal is on it interrupts the power turning it on and off only brighter.
Each socket has to have a good ground (wire)to complete the circuit






Smilys aren't working, maybe They have a bad ground
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Old 11-09-2009, 07:28 AM
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I cant tell if its original. Its a mess of taped up wires. Im going to pull my hear out and start peeling tape off.


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Old 11-09-2009, 07:31 AM
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If it is taped up I would bet it is a bad connection in where they joined the wires.
When repairing the connections Solder and shrink tube the connections otherwise you will have headaches down the road.
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Old 11-09-2009, 07:37 AM
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Thats what Im thinking is its original wiring up to the split at the rear. That would be exposed to the elements more. I hope I can find the problem, I just hate wires. Cant I just wave my arm out the window?
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Old 11-09-2009, 12:59 PM
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To start with ..Everything runs through the Turn signal switch

The wiring Ford uses allows for the brake light filament and TS filament to work like they normally due.

This T-Shooting guide may help you.

The ground strap for tailights is located behind the taillight attached to the box on a styleside.



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  #10  
Old 11-09-2009, 03:00 PM
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I hate wiring. Let me get that out of the way

So what Idid on my '76 is rewired it with a fresh trailer wiring harness from the auto parts store. Now I know that all of the wires are new and good.

I started at the 4-plug socket where it comes out of the firewall and ran the wires all the way back to the light. The trailer harness is nice because the wires are already lable with left/right/brake and the white on is the ground.

I did that and haven't had any problems with my light working.

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