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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

frame trailer connector color code

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Old Jul 22, 2017 | 01:06 AM
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frame trailer connector color code

Hi, can anyone tell me what the red wire is for?
Wasn´t able to get any hint what it does.

Green and green/black is turn, yellow is marker lights.

Truck is 1984 F250 Supercab 4x4 Diesel, the connector is located behind the rear fuel tank close to the bumper.

Thank you.
 
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Old Jul 22, 2017 | 06:10 AM
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Did you measure any voltage on it?
 
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Old Jul 22, 2017 | 06:30 AM
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Yea I would check for power on it and if it does when this happens like when backing up, etc.
Does the truck have a electric brake controller? I don't think so as they came out a few years later.
Any way if you have the left brake/turn, right brake/turn, running lights.
The only others I can think of would be ground (most of the time it is white or black on the trailer), back up light.
If it had a trailer pk then could have trailer brake & a power line to charge a batt. on the trailer. Most of the time the brake & power are heavier gauge wire.
That is all I can think of at this time.
Dave ----
 
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Old Jul 22, 2017 | 08:35 AM
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Trailer brake lamps, but only if you have the trailer brake controller installed: Trailer Option - ???Gary's Garagemahal.
 
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Old Jul 22, 2017 | 12:13 PM
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Originally Posted by Gary Lewis
Trailer brake lamps, but only if you have the trailer brake controller installed: Trailer Option - ???Gary's Garagemahal.
I looked at that Gary but none of the colors match. Ford's trailer wiring was a mess back then. They seemed to change it every year. Some years had different colors, some years had 1 relay some several relays, then they would not have any relays. Unless you have the exact year factory diagrams, its hard to keep track of the trailer wiring.
 
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Old Jul 22, 2017 | 12:21 PM
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Dave - The red looks to have a stripe, which could be green. So, that would be a match. And there looks to be a white and a yellow. But the 4th wire doesn't appear to be black. But, 3 out of 4 seem to match. What am I missing?

Having said that, yes Ford's trailer wiring was a mess in that era. And the EVTM doesn't really answer all the questions. But, if the OP would check those wires he might discover that three of the four are correct.

On the other hand, if the rest of the wiring has been done the way the blue/white ground in the right of the picture was done then there's no hope.
 
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Old Jul 22, 2017 | 12:25 PM
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Your right, these old wires fade and their colors are hard to make out sometimes.
 
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Old Jul 22, 2017 | 10:56 PM
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crawlin-kingsnake - if you are willing, you could un-tape the other side of the connector and verify colors there.

I have an 84' EVTM at the house, when I get back in town on wed, I'll post, if not resolved by then.
 
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Old Jul 23, 2017 | 12:44 AM
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Well, I checked the colors and I was wrong due to fading.
Correct (at least what I can tell now) is:

Light green/black (thicker gauge than the rest)
Red/black
Light green/white
White/light blue

I have to check if the red/bk is backup which I assume from your answers.


The blue/white "ground" wire you see in the pic was just for quick testing with a bulb to ground to see what wire does what. It was better visible from the cab than the meter
 
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Old Jul 26, 2017 | 11:07 PM
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FYI - The 84' EVTM is the same as the 86'
 

Last edited by vjsimone; Jul 27, 2017 at 07:47 AM. Reason: Modify Text
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Old Jul 27, 2017 | 06:55 AM
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No, I don't think red/black is backup as those should be black/pink.

Try Page 49 here: Lights: - ???Gary's Garagemahal. From that I deduce:
  • Your white/light blue is actually orange/light blue, and that is right stop/turn
  • Your light green/white is actually light green/orange which is left stop/turn
  • Your red/black I haven't found
  • Your light green/black I haven't found
 
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