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Running lights down both sides of a trailer usually means extra splicing or jumper wires, but this 35 Ft 4-Way Wishbone Trailer Wiring Harness makes it easier. It splits the running light circuit into two brown wires so you can run one down each side. That saves a lot of time and keeps everything neat without crossing wires from side to side.
If you’ve ever come up short halfway through wiring, you’ll appreciate the full 35 feet of length on this harness. It works well even for long flatbeds or boat trailers, and any extra wire can just be trimmed down when you’re done. You get room to route wiring cleanly without stretching or patching extensions.
Hook-up is straightforward with the standard 4-flat configuration. The green wire handles right turn and brake, yellow is for left turn and brake, the brown pair runs the tail and marker lights, and the white wire provides ground. Each color follows standard trailer wiring layouts so you can match them up quickly during install.
Each of the four wires in the harness uses 20 AWG copper strands for flexibility and dependable signal transfer to your lights. The white ground wire comes at a 42" lead, giving you enough reach to find a clean ground point on the trailer frame for a solid connection.
Whether you’re rewiring an old trailer or starting fresh, this universal splice-in harness fits a wide range of setups. It’s an easy way to replace damaged wiring or convert from a different connector style while keeping a standard 4-flat connection ready to plug in at the hitch.
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
Eric
1/29/2019
After one year, It is still working great! It makes all the difference having long enough wires to where there is no splicing on a saltwater boat trailer.
Castaway
6/14/2024
Works as it should.
Bud
8/2/2025
Its working just great, no problems.
Heather A.
3/19/2025
Looks great Michael! Thanks for sharing your install photo with us.
Steve
10/9/2020
Trailer lights are working great. Being led and submersible is just what I need.
Fred S.
7/9/2015
Everything is fine and I want to thank you for your fine service. The trailer is working very hard for the family.
Lauri
5/18/2021
Working like a charm. Still happy with the product and the outcome.
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Ray
8/17/2025
Working great