Electrical Fire: Need Help Rewiring

[Big Laker]

Hey All-

I have a 2019 Forest River 23MK that I rented out over the Independence Day Holiday. Unfortunately the renters didn't pay attention to the slack in the 7-pin wiring harness and it dragged on the ground causing a lot of heat and small fire.

Almost all of the wiring north of the frame was melted, even going into the metal junction box underneath the trailer.

I spoke to a dealer about gettin git fixed, but there are two weeks out. I have another renter lined up for Saturday and really wanted to get the new wiring installed and make my travel trailer available.

After getting the new 7-pin harness wired and installed, as well as the new runaway brake controller, I learned today that travel trailers really have no standards when it comes to wiring.

I need to figure out how to test each wire so I can make the proper connections.

Here's what I do know...

The old 7-Pin wiring harness has these connections in the junction box:

White = Grounded to box with 2 other white wires
Black = Connected to bottom right of four post block to left of junction box
Blue = Connected to 2 wires; 1 blue in gray sheathing to trailer (brakes, I assume); 1 wire from runaway brake control
Green = Connected to green wire going to trailer
Red = Green = Connected to red wire going to trailer
Brown = Connected to brown wire going to trailer
Yellow = No idea


I'm fairly certain I have the wiring correct for the four-screw post block as that's there the battery cables and power from the 7-pin harness terminates.

Is anyone able to lend a hand?
Ideally I want to finish this by Thursday evening, to give the renter time to back out in case I don't finish.

 

[GTS225]

White is vehicle ground. This ties your tow vehicle ground to the trailer's ground. Critical for the running/brake/turn signals on the trailer.
Green is your right turn/stop light.
Yellow is your left turn/stop.
Brown is your side markers/tail lights.
I would assume the red is larger gauge than all the rest, and this'll most likely be a 12 VDC power supply for the trailer's internal lighting and control for the furnace, fridge, and water heater. (When they're running on propane.) There should also be a fuse holder located up front, perhaps just aft of the trailer's front crossmember. This red may also tie into the trailer's on-board battery.
Blue is typically your trailer brakes.

These are standard color coding for trailer wiring, and should show up with any correctly worded Google search.

I do not understand the line; "red=green=connected to red wire going to trailer". Might that be a typo?

Roger

 

[Big Laker]

I do not understand the line; "red=green=connected to red wire going to trailer". Might that be a typo?

Thanks so much Roger!

Nearly everywhere I looked the found the same answer, and that's forest River has no standard when it comes to wiring.

I've been racking my brain on trying to figure out a way to test my new connections since there's no power, so. this will help me greatly.

And yes, the Red = Green = Connected to red wire ... was a late night copy paste typo. It should read Red = Red ...

 

[GTS225]

Well, it may be true that Forest River has no "standard" when it comes to wiring the camper shell, but there is a standard for trailer chassis wiring, and that's the color code I gave you above.
Additionally, there is a standard for 120 volt alternating current wiring and practices, and that's the National Electrical Code. However, an RV type "home" isn't considered a permanent dwelling, (at least it wasn't in days gone by), and a number of sections of the code don't necessarily apply to campers, and they can get away with quite a bit of variation.

Roger