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We focus on providing high quality auto parts. Aiming to develop durable and good-looking products. To make your journey much more enjoyable and memorable.
Serlainxin 50Ft 4 Wire 4 Pin Flat Plug Trailer Wiring Harness Kit
- Anti-corrosion: Our 4 wire trailer wiring harness use thickened PVC wire coating materials and copper wire. Can resist aging caused by harsh weather.
- All In One Kit: Trailer wiring harness kit includes wire clips and hooks. No need to buy it separatly.
- Easy To Install: 18 Gauge Color Coded trailer wire helps distinguish the function of each wire.
- Wishbone Wire Design: These 4 wire trailer wiring harness split at the trailer tongue and run down each side of the trailer, no need for splicing wires.
- 42ft Male Wire & 8ft Female Wire Included: Provide enough cable length for trailer light wire replacement.
- Universal Application: Our 4 wire trailer wire use Standard 4 Pin Flat Plug, Universal fits for 4 wire trailer light wire replacement.
Key Features
Corrosion-resistant
Our trailer wiring harness use thickened high quality PVC wire coating materials and copper wire.
Can resist aging caused by harsh weather.
No brittleness and break. Have a long service life.
All In One Kit
Trailer wiring harness kit includes wire clips and hooks. No need to buy it separatly.
Trailer wiring harness kit include one 42ft male wire and a 8ft female wire. Provide enough cable length for installation.
Easy To Install
Color coded 18 AWG wires clearly identifies each trailer wire's function. Makes installation safe and easy.
These 4 wire trailer wiring harness use wishbone design. Split at the trailer tongue and run down each side of the trailer, no need for splicing wires.
Wiring Instruction
Specification:
Trailer Wire Gauge: 18AWG copper wire
Male Trailer Wire Length: 42ft (White Ground Wire Lenght: 4Ft)
Female Trailer Wire Length: 8ft (White Ground Wire Lenght: 8Ft)
Trailer Wire Plug: Standard 4 Pin flat plug
Type: Wishbone style trailer wiring
How to Use:
White trailer wire is ground wire, to the trailer's frame.
Brown trailer wire to the running light wire.
Yellow trailer wire to the left turn or brake light wire.
Green trailer wire to the right turn or brake light wire.
Notes:
Please seal the trailer wire joints before using outdoors or underwater.
Package include:
42ft male trailer wire*1, 8ft female trailer wire*1, wire clip*4, hooks*10
Application: Perfect for 50ft 4 wire 4 pin flat plug trailer light wire replacement.
Alan from Minnesota
2025-08-07 13:44:44
When wiring a trailer, the brown wire is for tail lights, and the yellow and green are for left and right turn signals/brakes, respectively. What makes this harness very nice and easy to use is that there are two brown wires from the plug-in, one for each taillight! In addition, one is molded to the yellow wire for the left side, and one is molded to the green, for the right side, making it much easier to run your wires without getting a tangled mess under your trailer. The wire insulation is soft and pliable and easy to work with. There was also a package of six splices included that wasn't mentioned in the description. There were no directions included, but if you've never wired a trailer before, directions can be found in the product description or on a google search. 18 gauge wire is adequate for running LED lighting, but if you have bulb style lights you might want to get a heavier duty wire harness, such as 16 or 14 gauge.
Paul Csornok
2025-05-28 14:25:09
I replaced my old wiring on my trailer with this and it works fine. Easier than patching the old wire.
john rossi
2025-05-09 14:18:16
Five stars
CS
2025-05-08 18:29:06
The fact that the wires were paired easy to run .I would of liked the common wire to be same length as other wires as i wired it all the way back.
Antonio Cordel
2025-04-23 12:53:05
Like it all. Plenty of wire to service side markers and rear brakes
Little Padawan
2025-04-03 14:54:34
REDOING A BOAT TRAILER, AND ALL THE LIGHT KITS DON'T COME WITH LONG ENOUGH WIRES. BOUGHT THIS TO ELEMINATE EXTRA UNNEEDED CONNECTIONS. WORKED EXACTLY AS I NEEDED.
GLENN PISCATELLI
2025-01-19 11:11:01
Seems to be on the top end of the specs for the product. Noticeable difference in comparison to what I was replacing.
Daniel
2024-12-08 16:13:02
I bought this two years ago to rewire my boat trailer and have since learned that it was a terrible idea. Because I understand the importance of keeping water out, I used crimp and solder connectors with glue when I needed to connect to it, and went back over top of them with the glue heat shrink. When I was done, the only exposed wires were the marker lights that were on poles that stay well above the water line, and the ground wire that hooks to the tongue of the trailer, which comes with an exposed lug on the harness. Neither one of these parts has ever been splashed, or been underwater. Despite this, the ground wire was corroded so badly, it was breaking off when I tried to cut it back and strip it, and there's some sort of problem with one of the marker wires even though I've checked and everything is still sealed.TL/DR: This says it is for boat trailers but it isn't. If you're rewiring a boat trailer, get a proper harness with marine grade tinned wire instead or you'll be re-doing it very soon. Honestly, even if you're doing something else, get a tinned marine grade harness anyway for all the more difference in price.
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