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The 25 Ft 5-Way Trailer Wiring Harness from Optronics provides a straightforward way to control your trailer light functions with ease. Perfect for boat trailers and others with hydraulic or surge brakes, its wishbone-style design simplifies the installation by splitting the tail light wires. This lets you run separate wires to each side of the trailer without needing additional jumper wires, ensuring that your lighting is always reliable.
Forget the anxiety when backing up with a trailer. This harness includes a blue auxiliary wire that connects to your tow vehicle's backup light circuit, signaling the trailer’s brakes to disengage when reversing. This feature is particularly beneficial for trailers with hydraulic actuators equipped with an electric lockout, providing smooth and stress-free reversing every time.
You'll breathe a sigh of relief with the color-coded wiring, which makes installation a breeze. Each wire is distinct: white for ground, brown for tail lights, yellow for driver’s side stop and turn, green for passenger side stop and turn, and blue for the auxiliary wire. It's all about making DIY installation straightforward and efficient.
Built to withstand harsh environments, this wiring harness is well suited for boat trailers, particularly those used in saltwater. Its high-quality materials ensure minimal corrosion, even with frequent exposure to water, and restore your trailer to a reliable towing vehicle, meeting today’s trailer wiring standards.
Whether you’re upgrading or replacing an existing harness, this product provides a tailored fit and versatility that handles various needs. It's compatible for straightforward swap-outs with other popular models like Truck Lite #002275, making it an ideal solution for replacing old or inadequate systems with a robust and convenient harness.
With 25 feet of durable, 20-gauge wire, this harness is perfectly suited for longer trailers, offering ample length to reach end-to-end without splicing. It also includes a 30-inch ground wire and a 5-foot aux wire to cater to specific wiring requirements. For large trailers, having enough wire to work with eliminates the stress of complicated extensions and ensures a clean, hassle-free installation.
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Works very well. Ran the wires down the tubes of my boat trailer and installed the tail lights and runners very easily. Cut the excess wire off and lights are solid after one year on my boat trailer.
I installed this on a Moomba boat trailer and it fit perfectly. Installation was easy enough. Paired with e-trailer's submersible LED trailer lights, the parts went together for a seamless, durable system that will last for years to come. The boat trailer looks like new again! Thanks e-trailer!!
Item is just what I need to rewire my 99 Triton boat trailer. Item is of great quality and at a competitive price. In addition,the item was shipped and delivered fast. Lastly, staff members are courteous and willing to assist with any questions and concerns before ordering and upon arrival. I will definitely do business with in the future.
So, I converted my brand new Loadrite trailer to LED'S and wanted to add up a reverse light. I purchased this 5 wires trailer light harness to do the trick. Very good quality and the color code stayed the same. Had no problem what so ever and was an easy swap. I soldered every wires and protect them with heat shrink tubing and that should last a very long time.
Thank you.
Vincent
5/19/2019
George, after one year, Im pleased to say that your product still perform flawlessly. All is good with the harness and would recommended to all of your potential customer. Thank you for the follow up a year later, really show whos taking care of his customer. Again, thank you,
Just as described, good harness at a good price.
I purchased this set to rewire my race car trailer and add reverse lights to the pigtail... wiring went flawlessly and there was plenty of wire and connectors are good quality... even had a dog chew on the trailer end and other than a slight ground issue, works perfectly.
Very high quality wire, easily stripped outer and very good quality copper wire within. All connections were spliced and soldered, covered with heat shrink.
Easy to use. Again, having back-up is a game changer. Long overdue and nice to have affordable quality product to upgrade with.
Got this wiring harness for my small camper to completely re wire it. Also got rheTLl28RK combination trailer lights. Nice and bright!
Average quality, very good shipping time plus hard to find item but etrailer had it.will definitely be buying from you guys in the future.
5-wire harness kit is exactly what I need. I hate splicing wiring runs because, in a saltwater environment, this only leads to more chances for corrosion. The only thing that would be better is the complete round plug set-up.
My boat and truck are happy!
Easy to install perfect length and works great!! Can’t see it on the trailer because I have it heat shrinked and wire loomed for protection
shipped fast, exactly what I ordered. Great quality
This product was exactly what I was looking for. I was having issues with my trailer lights on a 20 year old trailer. I decided it was best to just remove all of the old wiring and start off new. This product took care of any concerns i might have had by just replacing a wire or two. All of the lights and connections are excellent and I don't worry about something not working.
After having this in my garage for about 6-9 months I finally got around to rewiring my trailer with this harness. The harness has been on the trailer for 4 months and it has been solid. I would recommend getting longer than you think you will need. IE if you have a 25 ft trailer get a harness that is ~30 ft.
Wiring is great. Was given 2 truck tail lights with back up lenses so I needed to rewire my trailer for a 5 wire system. My trailer is 30 years old so it needed a complete makeover. e trailer was a great help. They had a 5 wiring harness and a duel trailer connector for my Jeep. I needed a 4 wire and a 5 wire adapter to fit the Jeep to 2 trailers I own. They had what I wanted and it was delivered in 3 days.
Everything I ordered is in the box! Excited to get it all installed.
This wiring is almost plug and play! It is already set up with double brown wires to meet today's trailer wiring standard. And with the hitch-end flat plug and ground ring already in place, it is a quick installation. Thanks.
Great, I think I will enjoy the install, with all that's going on in the World. Thanks for the extremely fast delivery and help with making my selections!
I did make one mistake, the Thin LED Light I order; I think I need to order the base bracket as well!
Needed to replace my wiring on my 18 foot boat trailer. This did the job. Easy plug and play.
Product works well. Installed on boat trailer used primarily in saltwater. Corrosion is minimal.
I. ordered this along with marker lights its been a year and they work great.
I have been in sales, retail, B2B, and sales management for over 30 years. E trailer has the whole package - excellent customer and sales service, great products, videos for those of us who like to do our own work, fair prices, and my go-to for my trailer needs.
Fast shipping and great product. Easy to install on my boat trailer. Will test the longevity of this product over the next several years. But overall very pleased, and etrailer is a wonderful company.
WORKED GREAT.
Worked exactly how I needed it to.
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Brooke M.
3/12/2025
So glad to hear that, Derek! We just had a tutorial here at the office and I was blown away at how straight forward it can be. What do you haul with the trailer? Anything fun?