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Old 11-08-2015, 09:49 PM   #1
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Replacing the 7pin trailer wire

While towing my Puma 31bhss this weekend I noticed I didn't have any lights on the trailer. Once I got to a safe place to pull over I found the electric wire had come disconnected and dragged for a while. There are now spots where bare wire is exposed. My question is, where can I get a wiring diagram inside the junction box to make sure I connect the replacement properly?

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Old 11-08-2015, 09:59 PM   #2
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Old 11-08-2015, 11:01 PM   #3
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Here's the diagram of the plug on the trailer and truck end. If you're replacing the entire pigtail from the junction box to the plug end, note the color of the wire at each particular terminal in the plug. Manufacturers don't always use the same color wires like one would hope.
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Old 11-09-2015, 05:18 AM   #4
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The pin locations are accurate but wire colors on the trailer side may not be. For example my reverse lights wire on my FR trailer pigtail is yellow.

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Old 11-09-2015, 06:42 AM   #5
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On my first backing of a 5th wheel TT i heard a lot of crunching and snapping... DW thought it was teh truck - I thought it was the trailer axles.
She was right.
Somehow I severed the connection between the pin and the bumper and fried a 32 dollar breaker in the truck shorting the wiring out.

Not only did I cut the line in 2 pieces but I ripped the wiring out of the junction box at the trailer end.

I was kind of shocked that none of the stores locally sell 7 pin wiring and had to go to parts for trucks...

I wired the connections in 2 pieces with a round 7 pin Reese connector at the trailer end and 4 feet of new wiring.
(type that normally fits into the bumper of the truck.)

I then used marine grade Marr connectors in the junction box.

Then I took the 7 pin that fits on the bumper and left it alone at that end

On the cut end I put a female junction made by Reese (in the middle of the second piece) so the trailer male end connects the 2 pieces.

Worked out great because I also purchased a second Female 7 way to 4 way flat connector for tying into the trailer battery and run my park/tail lights when we are at the park on shore power.
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Old 11-09-2015, 11:58 AM   #6
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7 pin plugs/wiring

I cut mine turning sharp.

Tractor Supply had plugs, pigtail and everything else:
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Old 11-09-2015, 12:09 PM   #7
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Correct code is:
Black Batt. Pos+
White Batt, Neg -
Blue Elect, Brakes
Green Trailer Running Lights
Brown Right turn/stop
Red Left turn/ stop
Yellow Back up (center)
This is the correct code for all Commercial 7 wire connections, colors are stamped on the plug at the brass connectors inside the plug assy.
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Old 11-09-2015, 12:22 PM   #8
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Dog chewed mine---twice!!
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Old 11-09-2015, 12:38 PM   #9
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Originally Posted by pdqparalegal1 View Post
Dog chewed mine---twice!!
Do you still have that dog and/or did you have a nice funeral for it?
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Old 11-09-2015, 01:17 PM   #10
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When I changed out my camper cord to the truck, I just opened everything up so I could see all the wires and then put one wire at a time thru the hole and disconnected one color at a time and hooked each color one at a time until done, then taped with electrical tape. So much fun I have to do it again since I cut it again through stupidity again.

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