Waterproof wire splice trailer lights11/16/2023 ![]() Solder makes a nice connection, but I don't use solder in the race cars because vibration can cause issues unless the wire is supported at the splice. IF I had to rewire it, I would likely use solder and crimp. I re-packed the bearings last year and checked all the connections - no issues with power, stops just fine, lights all work, etc. I'm not saying there isn't better, but I'm not going to go fix what isn't broke. It stops on a dime, have to turn the brake controller waaay down or it'll yank the ass end off the truck. I'll look under the box trailer when I get time, but I'm betting it's got SLs under it too. When I use a 4x4 usually use the left for a j box, I think maybe my helper wired this old truck and added an extra box, didn't really hurt and gave a place to hook trailer wiring with ease. You can pole it with an awl, insert a wire and it will s3elf close a hole, used extension cord often makes for great pieces of fixture wire, super easy to tie up and clamp in to a box. ![]() Rolled black tubing is wonderful, super easy to push wire and often used when replacing whole looms on trucks, shove a piece from the fire wall to the bumper box. The pics above with this one were demo pics to show the various connections, my fave is simple cable connectors, they can even be reversed which I often do. It covers all the fixture studs and connections, as I said common wire nut filled with spray and when they are on truck bumpers with constant washing we simply smear a little silicone on the top and sides, even in connectors and let the bottom open with a drain, these boxes look new inside and the screws even come loose. Obviously you will need a six prong connector to connect the trailer to the tow vehicle in this situation.I need some other pics, we have several of these in service. One to control the boat trailer brakes, and one auxiliary power to charge the battery that you will need to have on the trailer so the brakes can be energized should the trailer come unhitched from the tow vehicle. If you are wiring a boat trailer for boat trailer electric brakes the following boat trailer wiring diagram has two more circuits. You may as well get waterproof splice connectors to splice in the clearance lights while you are at it.Ĭorroded wire connectors are a common source of trailer light problems, so better to do it right, and you will be trouble free for a long time. They are available at marine hardware stores and are a crimp connector with a waterproofing adhesive inside and an integral heat shrink cover to seal the connection. When connecting the wire harness to the light assemblies at the rear of the trailer it is best to use waterproof butt crimp connectors. (one is brown and green and one is brown and yellow, the photo only shows the yellow side of the brown and yellow wire) There are two brown wires to provide power for tail lights to each side of the trailer. Notice the four prong connector on my boat trailer has 5 wires coming out the bottom. The standard four prong connector to connect the trailer to the tow vehicle is perfect for a simple trailer light system. The white wire (ground) on the following boat trailer wiring diagram is drawn in grey so that you can see it against the white background. Poor ground connection to the trailer frame is a common problem with lights that don't work.īelow is a simple wire diagram for a standard four wire light harness. Many light assemblies use the mounting bolts as their ground connection, so clean the metal surface around the mounting bolt holes down to bare metal. Also make sure the ground connection on the light assemblies connects to bare metal. Make sure the ground wire on the trailer is attached to bare metal, not to painted or galvanized metal. I was doing a pre-season inspection of my trailer, which was only 2 years old at the time, and I noticed the ground wire on the trailer is screwed to galvanized metal, and the screw is not tight. It is pretty simple to do, and then you know your lights will work! I have had light issues on an old trailer and to be honest it was quicker and way less hassle just to pull out the old wiring and lights and start again with a fresh wire harness and new lights. ![]() It may be to just connect the trailer lights on your vehicle, or you may find yourself rewiring the whole trailer with new LED boat trailer lights and a new wire harness. Wiring a boat trailer is something that many boaters find themselves needing to do sooner or later.
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