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Running wiring down a full-length trailer can get messy fast. This 4-Way Wishbone Trailer Wiring Harness with 42" ground wire keeps things organized with a 40' lead that reaches both sides of the trailer without needing extra splices. Each function is already split between the left and right sides, so you can route the lines cleanly and avoid crossed or shorted signals.
When one side of your trailer light goes out, finding the problem can take time. The wishbone design gives each side its own running light wire, making it simple to isolate issues and test each circuit independently. It’s a straightforward setup that saves time when tracking down a bad connection or light.
Good grounding is key for consistent lighting signals. This harness includes a 42" ground wire that ties in close to the plug, keeping your ground solid where it matters most. That means fewer flickers, better contact, and dependable performance every trip.
Whether you’re replacing worn wiring or building a custom lighting setup, this splice-in harness works with standard 4-flat trailer connectors. The universal fit makes it easy to pair with existing plugs or new connectors, giving you flexibility for everything from small utility trailers to longer setups.
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
Fast service and product was as expecte d.
Great product. Exactly what I wanted.
Easy install works perfect
Fast and prompt service will buy from you again.
Just what the doctor ordered!
Amazing service, exactly what they said, speedy service and delivery. WOW
this was what I was lookin for there was no surprises.
Ordered what i need and got it quickly
Great price, order shipped same day, part worked perfectly. Can't ask any more than that.
Made wiring my trailer a breeze!
Excellent and super fast shipping
Great harness! Worked as expected! Thank you!
Quality product, easy installation.
Ez install, working perfectly after one year. Would order again if needed!
Perfect wiring for my trailer
your shipping was great was set for 10 days and arrived in only two. product was as expected
Worked great for my old trailer re wire project.
Placed order and within a few days I was able to wire trailer without no problems. They are great people to talk to and help with any questions I had regarding to wiring.
In this case the product is a simple wiring harness. What is important is that I needed it quickly and it was delivered on time. My trailer is rewired and back in service.
I was lucky to find a harness this long.
Terry
8/22/2022
Its been about a year and the harness is still working good.
Just what I needed to rewire an old boat trailer while I was replacing all the lights with new waterproof LED lighting.
Fast delivery, good product. I had a hard time finding a wiring harness long enough for my boat trailer, and the 42" ground wire setup had a really nice setup.
My trailer takes a beating year after year. Replaced all my lights on my utility trailer last year. Lights still look new and all work even sitting in extreme weather.
Installed this on a 5x8 enclosed trailer. It was long enough to go down both sides and up the rear and all the way to the upper front marker lights. Cheaper than Amazon too.
I have a 24' pontoon trailer. The harness was plenty long to reach all the way to the tail lights, I especially like the protection around the harness at the connector end.
The trailer has been in and out of the water a few times with no consequences.
I would recommend this harness for any one who need to rewire their trailer for a very reasonable cost.
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Richard
11/25/2022
Still perfect, glad I purchased it. Would do it again.