7 Way Molded Plug Trailer Cord Harness

[Rhody]

Hello!

Question...
Someone was nice enough to attempt to cut my 7 Way Trailer Cord that plugs into my truck with what looks like a pair of dikes.

I tried a few RV places (CW) ect to get an estimate, but I got the old "Umm, Errr, Uhh Ya we would have to see it to know how much it will cost.
You would think I could get a ball park idea...
Has anyone on here ever had one replaced??
Just trying to get a ball park price on replacement and install.

As always...Thank you!


Rhody

[retiredcamper47]

Rhody, Do it yourself and save $$.

1. Measure the length of the cord. I think they come in various lengths.

2. Go to any rv place or on line and buy a new one.

3. The end of the 12v cord goes into a metal box underneath your trailer
(front street side corner).

4. Take the cover off the box, take a picture of how the wires connect
(color to color) usually connected with wire nuts.

5. Disconnect necessary wires, pull old cord out of box and put new cord
into the box.

6. Reattach wires from new cord to the proper wires in the box. Might
have to strip the ends of the new wires before reattaching.

7. Attach wire nuts tightly and tape the nuts and wires together. I always
tape the wirenuts to the wires to prevent them from coming loose while
traveling.

8. Replace cover on box and plug the cord into your tow vehicle to test.
You might have to use nylon bands to attach the cord to the trailer
frame to keep the cord in place.

Hope this helps.

Bob

[Rhody]

Thank you Bob!
I am not much of an electrician, but I may take a stab at it when it warms up!

Thanks again!

[doc73]

Yes, very easy to replace. Either the whole new cord (probably best) or a new end piece after cutting off the bad part (assuming it has enough etra wire). Just take a picture of the wire colors as they are wired in the J box then match up the new one. Easy peezy.

[Witch Doctor]

As said it is easier to cut the end off and replace it with a molded plug right to the box It is easier then just buying a new end. A 5' plug should cost around 40 or 50 bucks depending on what you buy, Make sure the plug in is the same, they have 2 different ones. More the likely you need the spaded end not the pointed one.

[18CrewDually]

This is what I buy when I replace the pigtails on trailers. These plugs are sealed and have double contacts for the best connection. This one is 8 ft long and can be cut to length. Also here's the diagram to help you along. Don't count on the colors matching so test the old plug with a test light while plugged into the truck. Write down what color does what and keep it with your trailer paperwork for the future.
https://www.amazon.com/dp/B01FWIFSCE..._s7d0ybSMVRAHY

[Scrapper]

Try to get the waterproof gel filled wire nuts. They cost a little more but are worth it.

[TGR]

A quick look into the metal box where your cable is spliced into the RV's wiring will let you know if you are able to handle the job yourself. Towing your RV without brakes and lights should be avoided.

The only thing I can add to the advice you've already received is to disconnect all wires hooked to your RV battery's negative terminal before taking things apart, as the wire on terminal 4 would likely have battery voltage.

[Scrapper]

You could also use rubber mastic electrical tape to make it waterproof but it will make it harder to make repairs later.

[pdqparalegal1]

Originally Posted by Rhody

Hello!

Question...
Someone was nice enough to attempt to cut my 7 Way Trailer Cord that plugs into my truck with what looks like a pair of dikes.

I tried a few RV places (CW) ect to get an estimate, but I got the old "Umm, Errr, Uhh Ya we would have to see it to know how much it will cost.
You would think I could get a ball park idea...
Has anyone on here ever had one replaced??
Just trying to get a ball park price on replacement and install.

As always...Thank you!


Rhody

I have had two partially cut cables. Not vandalism---I turned to sharp. Replacements re found at Tractor Supply or most other farm, trailer, Harbor Freight type places. Open your junctiion box and take good pictures. One wire at a time.

[DustyRoads]

Last year my cable dragged on the ground and shorted out. I cut out bad section and spliced back together with waterproof connectors. Very easy to do just take your time.

[5picker]

I've seen several cables where someone 'thought' that someone else had vandalized the 7 wire cable but as mentioned earlier, it was actually cut by being pinched on some part of the trailer or hitch area.

Make sure once you fix the cord that it is routed correctly in the event of a sharp turning situation.

[dmchapman]

Originally Posted by pdqparalegal1

I have had two partially cut cables. Not vandalism---I turned to sharp. Replacements re found at Tractor Supply or most other farm, trailer, Harbor Freight type places. Open your junctiion box and take good pictures. One wire at a time.

Last Summer I was trying to back into a spot at Half Moon Bay, CA. The angle was backward for the one way traffic lane. The sharp angle cut my cord same as yours. Also blew several fuses on the truck and the circuit breaker on the trailer. I used crimp type butt splices as a temporary fix and later sealed the repair with epoxy. Looks terrible but still works. I may not buy the new cord.

[Jim in Halifax]

Personally I would solder all the ends before I put it in the box AND DO NOT use connectors,,,,Solder and tape all connections!!!!!!Much better and safer......