Trailer Wiring Junction Box Installation

Trailer Wiring Junction Box Installation: This is a must when buying an old trailer takes no time and will save you lots of headaches when adding or replacing lights and wording later on.

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[davidwright]

This is the only one that actually show you each step wiring the box. Thank you so much as I’ve been trying this box the last 3 days.

[kathleenneiley]

I've watched dozens of these wiring videos and you actually made it very clear. Thank you!!!

[Thomas]

I bought the exact same junction box on Amazon. Very helpful!

[mlieser]

Many years ago I had an old car trailer that I rewired with all new lights and brakes. I wanted to create a setup like this junction box as there were no commercially manufactured units. I have a great dislike of Scotch locks that everyone recommended to use. I ended up running extra wires from the 7 pin plug. The junction box makes troubleshooting much easier in the future.

[mikeelder]

I've wired dozens of these junction boxes. Our company ran 25 foot gooseneck trailers.
I used ring terminals for connections.
I used the white, blue or red for ground depending on color availability. I really made an effort to use white though.

[rickwallin]

Thank you for the video and the diagram you've put together here!! Just used it last night to wire up my trailer and even got the reverse lights to operate. Thank you again!!

[edwardbell]

Best video on the subject I’ve seen so far. Thanks.

[ProjectNineOaks]

Great video! That junction box is very clean. This looks like a good option for me and my camper rebuild. Appreciate the help!

[vdreamer]

I have NEVER had a trailer that provided a good chassis ground. During trouble-shooting of trailer light issues I have found that the problem is usually caused by a bad ground. It is so easy to run a wire from the white wire on the harness to each light. This will give each light fixture a good ground and give you MUCH more reliable trailer lights.

[js]

Nice job and good explanation. I bought slightly used 16 foot double axle cargo trailer with brakes and was amazed to see the factory wiring used 3M ScotchLok connectors for the wire splices between the trailer lights and multi pin connecting cable. There was no junction box- just the connectors wrapped with many layers of electrical tape and well hidden between the crossmembers below the cargo box. Anything to save $8 during the manufacture! Two suggestions- 1) I mounted my junction box in a protected area like the inside edge of the trailer tongue under the overhang of the cargo box and 2) I don’t think most natural color zip ties have UV protection and will get brittle quickly out in the elements, the black ones I used had it and matched the flex conduit as a bonus.

[thealliedspy]

Thank you, I needed a refresher on this subject!

[sjepson]

Great video. Thanks. Now I need would like to see how to add to that the battery, battery charger for electric brakes/breakaway devise, and backup lights/backup bell.

[westonlee]

Informative information and process! Thanks!
Does the ground wire that you attached to the trailer frame also provide a ground for the brakes?
Thank for your answer

[barntt]

Put the box on the inside of the hitch so it's harder to break. On the outside they get bumpers jacked knifed into them, stood on etc! Ask me how I know! LOL! Y spades can come loose and fall off the stud! That is why they used ring spades. Thanks for the info!

[jamesschumacher]

Where does the yellow wire from trailer cord get hooked to in junction box on trailer

[johnpowell]

Great video. Can you add accessories to the hot side of the junction box like led work
Lights? Thanks

[blessedohanaoverland]

Thanks for the video! I have a couple questions. 1) I noticed you matched the wiring of the trailer to make it right with the junction box; does the junction box match the 7 pin on your tow vehicle?

[DrDJBadMed]

I have this same set up and wired like this, but when my truck light are on, the brake lights on the camper go off, howerver when the truck lights are off the brakes on the camper come on

[jamesschumacher]

Where do I hook up the yellow wire from plug cord to trailer which wire do I splice the yellow wire to?

[juanmoreno]

I just got mine today I got a question what’s the black wire for if my trailer doesn’t have a black wire or is it for the trailer breaks