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Wiring a trailer doesn’t have to be complicated. This 30 ft. wishbone 4-way harness keeps things easy with separate running light wires for each side, so you don’t have to splice across the trailer frame. The extra length gives you plenty of reach for longer trailers, and the built-in 30" ground wire helps make a solid, reliable connection.
Strong connections start with the right wire. This harness uses 20-gauge wire throughout, giving you dependable conductivity for all basic trailer light functions—running lights, left turn, right turn, and brake lights. It’s built to carry steady power without flicker or drop-off, even over the full 30 ft. run.
You don’t have to worry about matching oddball connectors. This harness uses the common 4-flat plug that works with most light-duty trailers and towing setups. It keeps your wiring simple and compatible across different tow vehicles and trailer types.
Whether you’re rewiring an older trailer or building a fresh setup from scratch, the splice-in design makes it straightforward. Just connect the color-coded leads where needed and you’re ready to go—clean, basic wiring that gets the job done without overcomplicating things.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer.com. Let's take a real quick look together at this Wishbone 4-Way Trailer Harness. Now, this is a 30 foot long Wishbone 4-Way Trailer Wiring Harness. As you can see, we have our four connectors here, and I do wanna point out that we do have a 30 inch ground wire, and that ground wire has a ring terminal attached to it, so it's gonna make it very easy for you to get this grounded to a clean surface. But really not much more to say about this. This is going to be 30 foot long.
It's gonna come bundle to you just like this, and then you're gonna be able to wire this the way that it's gonna work best for your application. You got your four wires there. But I think that's gonna wrap up our real quick look today. I do hope that our brief time together was helpful for you. Again, my name is Andy, thank you for joining me.
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Customer Satisfaction Score:
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Ratings & Reviews
30ft of wire
order came as scheduled and it is already installed.
I plugged in my 7-way upside down. Don't ask. I thought I fried everything before a huge trip. This little bundle allowed me to have a backup plan for my trailer lights.
Got it very quickly
Looks like excellent quality
just what I wanted-perfect
Nice harness, fast shipping!
nice wiring, i used this to rewire the inside of my Express trailer and it worked great.
Worked out great, fully rewired and all new lights on my boat trailer. Done it myself in an hour. Great products and service. I know where to look for my trailering needs!
Excellent company just a little slow on shipping.
Customer service was excellent, easy to work with and very understanding and patient. A great place to shop, buy and I would highly recommend them.
The wiring harness made rewiring my trailer a breeze since I have never done this kind of project before.
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.
Toni
5/28/2026
Still very happy with the wiring harness. So very glad I dont have to worry about my lights failing.