The Best Boat Trailer Wiring Harnesses for 2021

Nicholas Swartz
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Trailer wiring harnesses are little bundles of wires that are made specifically to simplify the trailer wiring process for car and recreational vehicle owners. These wires are safe, easy to install, and they can even save you time and money. Also, wiring harnesses can help you avoid mistakes in the wiring process. While wiring a trailer can be made easier with the help of a harness, you may want to consider having a professional do it.

NameCategoryProduct
Wesbar Wishbone Style Trailer Wiring HarnessBest OverallWesbar Wishbone Style Trailer Wiring Harness
CZC AUTO Trailer Wiring Harness KitBudget PickCZC AUTO Trailer Wiring Harness Kit
Hopkins Wire Flat Trailer Side Y-Harness ConnectorUpgrade PickHopkins Wire Flat Trailer Side Y-Harness Connector

1. Wesbar Wishbone Style Trailer Wiring Harness

Our rating: 9 / 10

Wesbar Wishbone Style Trailer Wiring Harness

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Pros:

  • Trailer lighting adapter and wiring harness
  • Tough wire
  • Easy to install
  • Affordable

Cons:

  • Ground wire might be too short

The Wesbar 707261 is the perfect way to connect your towing vehicle with your trailer. It also includes 4-way flat connectors. It is easy to mount and would probably last for a long time.

2. Miady 25ft Trailer Wiring Harness

Our rating: 9 / 10

Miady 25ft Trailer Wiring Harness

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Pros:

  • Extra long
  • Corrosion-resistant ground wire
  • Color code makes for easy installation

Cons:

  • Some buyers had shipping issues

The Miady 25ft trailer wiring harness is made of color-coded wires, and the connectors are UV-resistant and waterproof. It is important to note that this harness is designed for running lights only and not the braking lights.

3. SUZCO 25 Foot 4 Wire 4-Flat Trailer Light Wiring Harness Extension Kit

Our rating: 9 / 10

SUZCO 25 Foot 4 Wire 4-Flat Trailer Light Wiring Harness Extension Kit

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Pros:

  • The price is affordable
  • Easy installation with detailed instructions
  • Works with multiple different connections
  • Durable

Cons:

  • Might not last for a long time

For those who are just going to use the trailer occasionally and won’t be hauling anything too heavy, this is just the stuff. This is made of 18-gauge wire. It is designed to split at the trailer tongue and run down each side of the trailer. Overall, a good investment for your trailer.

4. ABN Trailer Wire Extension

Our rating: 9 / 10

ABN Trailer Wire Extension

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Pros:

  • Available in lengths of 1, 4, 8, 10, and 20 ft
  • Pre-color coded wire design
  • Weatherproof trailer connectors
  • Heavy-duty 20 gauge wires

Cons:

  • Cables not very flexible

The ABN trailer wire extension is a versatile wiring harness for boat trailers that includes all the necessary cables and connectors. The ABN trailer wire extension is sold in lengths of either 1, 4, 8, 10 or 20 ft.

5. 4 Pin Flat Trailer Wiring Harness Kit

Our rating: 9 / 10

4 Pin Flat Trailer Wiring Harness Kit

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Pros:

  • 25' Male & 4' Female included
  • Wishbone design
  • Easy and straight-forward installation

Cons:

  • Clips for securing the wiring are not included

This Trailer Wiring Harness Kit is a good and affordable option for your boat trailer. It comes color-coded and ready to set up. It even included a 2-year warranty, so you're covered even if anything goes wrong.

6. Shoreline Marine 4-Way Trailer Wire Harness

Our rating: 9 / 10

Shoreline Marine 4-Way Trailer Wire Harness

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Pros:

  • Mounting hardware included
  • Color-coded
  • Marine grade multi-stranded copper wire

Cons:

  • Might not be long enough for some users

The Shoreline Marine 4-Way Trailer Wire Harness ​has the capability of plugging into your boat trailer's brake lights, backup lights, and turn signals. This is a must-have when towing, so you don't have to worry about rear coverage and clear visibility with your trailer.

7. Hopkins Wire Flat Trailer Side Y-Harness Connector

Our rating: 9 / 10

Hopkins Wire Flat Trailer Side Y-Harness Connector

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Pros:

  • 30 feet long
  • Corrosion-resistant
  • Well made and durable

Cons:

  • Might be too short for some

The Hopkins 4 wire connector is an extended size 4 wire flat trailer connector that can be used for various trailer towing or trailer RV applications. It measures 30 feet long. It is corrosion-resistant and made to last.

8. MICTUNING Trailer Wiring Harness Extension Kit

Our rating: 8 / 10

MICTUNING Trailer Wiring Harness Extension Kit

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Pros:

  • Universal 4-way trailer wiring harness
  • 25-feet extension kit
  • Clear and well-written instructions

Cons:

  • Some of the wires may be too short

Get this wiring harness extension kit if you have a long trailer. This kit will give you a 25 feet extension. This extension is complete and includes 2 wires and 4-way connectors. The 18-gauge wire is a lot thinner than others, which may cause some concern. However, some users insist that the thinner gauge wires provide additional flexibility.

9. CZC AUTO Trailer Wiring Harness Kit

Our rating: 8 / 10

CZC AUTO Trailer Wiring Harness Kit

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Pros:

  • Very affordable
  • Pure copper core
  • Anti-corrosion
  • 2-year warranty

Cons:

  • Some buyers received defective products

If you want a good-quality trailer wiring harness, then the CZC auto trailer wiring harness should definitely make it on your list. It has plenty of quality features that should make it highly attractive to most. It features a pure copper core, and it's sealed, which gives it good anti-corrosion properties and makes it prone to be submerged for a long time.

Frequently Asked Questions (FAQ)

How do you rewire a boat trailer?

If your boat trailer has wiring problems, you should call a professional. It is not an easy task and probably not one you want to tackle on your own. But if you decide to choose a wiring harness, the task becomes much less strenuous. They all come with a wiring diagram, and it should be quite a straightforward process to do it yourself.

What are the best LED boat trailer lights?

LED boat lights are a must-have in many situations that boaters find themselves in, especially in the marine environment. A simple upgrade of commonly used white boat lights can help to make your trailer light at night, which can be a life-saver.

New LED boat trailer lights come in many varieties, and can be used in many different ways on your boat. Choosing LED boat lights depends on your boat's electrical and lighting needs.

While LED boat lights are known for being brighter and last longer, marine and boating supply companies understand boat lighting is only part of the equation in a successful boat upgrade.

Can LED trailer lights be submerged in water?

That is a tricky question that really depends on the quality of the LED lights you are using. The best option here is to purchase LED lights that are specially designed for boating. This way you can be sure that they are fine to be submerged.

Conclusion

Boating season is fast approaching, which pretty much means that your boat has to be in top shape right now. To get your boat ready for the big day, you need to upgrade your wiring harness. Fortunately, we’ve reviewed the best boat control wiring harnesses to help you make a purchase that you’ll be proud of for years to come.

Our Recommendation

NameCategoryProduct
Wesbar Wishbone Style Trailer Wiring HarnessBest OverallWesbar Wishbone Style Trailer Wiring Harness
CZC AUTO Trailer Wiring Harness KitBudget PickCZC AUTO Trailer Wiring Harness Kit
Hopkins Wire Flat Trailer Side Y-Harness ConnectorUpgrade PickHopkins Wire Flat Trailer Side Y-Harness Connector