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 compared to doing it yourself. 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. This installation is not a DIY project and you don’t want to surround your car’s battery with wires only to have the wires short out, possibly causing serious injury or death. If you’re dead-set on wiring your trailer yourself, a harness might still be a good idea as a backup or in case you make any mistakes that cut power to your trailer.

NameCategoryProduct
Wesbar 707261 Wishbone Style Trailer Wiring HarnessBest OverallWesbar 707261 Wishbone Style Trailer Wiring Harness
MICTUNING Trailer Wiring Harness Extension KitBudget PickMICTUNING Trailer Wiring Harness Extension Kit
Hopkins 48265 30' 4 Wire Flat Trailer Side Y-Harness ConnectorUpgrade PickHopkins 48265 30' 4 Wire Flat Trailer Side Y-Harness Connector

1. Wesbar 707261 Wishbone Style Trailer Wiring Harness

Our rating: 9 / 10

Wesbar 707261 Wishbone Style Trailer Wiring Harness

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Pros:

  • Trailer lighting adapter and wiring harness
  • 7/4-flat connector plugs into truck
  • Five round sealed beam light socket
  • Tough wire
  • Easy to install
  • Available in 5-, 10-, 20-and 25-foot lengths
  • Plastic connector and weather cap protect connectors
  • Mounting kit sold separately

2-Color.

The Wesbar 707261 is the perfect way to connect your towing vehicle with your trailer. It also includes both 4-way flat and 4-way round connectors.

This product is constructed from heavy-duty 16-gauge durable wire. It has 4-way flat connector plugs into the truck while the 5 round sealed beam sockets that fit with the lights.

2. Miady 25ft Trailer Wiring Harness

Our rating: 9 / 10

Miady 25ft Trailer Wiring Harness

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The Miady 25ft trailer wiring harness is made of 18 gauge wire which is thicker than most kits. The fuses used are ABYC class BC fuse. The wire comes color-coded 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 incredibly affordable
  • Easy installation with detailed instructions
  • Works with multiple different connections
  • Durable in case of sporting

For whom who are just going to use the trailer occasionally and won’t be hauling anything too heavy, this is just the stuff. It costs only a fraction of what a new trailer wiring harness would cost and it is just as functional.

4. ABN Trailer Wire Extension

Our rating: 9 / 10

ABN Trailer Wire Extension

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Pros:

  • Available in lengths of 10, 20, 30, and 50 ft
  • Braided flexcord design provides additional durability
  • Pre-color coded wire design
  • Heavy-duty PVC coating
  • Plastic strain reliefs for added durability
  • Weatherproof trailer connectors
  • Durable rubber grommets

Cons:

  • Cables not very flexible
  • Missing Link feature
  • Not 10 gauge wiring

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 10, 20, 30, or 50 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:

  • Constructed from super-flexible rubber sheathed 18 and 20 AWG wires, this 4-way wiring kit includes 25' of heavy duty flat trailer wire and a 4' pigtail wiring harness with a “claw clip” connector.
  • This product is constructed with all of the necessary hardware for installation including a trailer socket, ground lug, fuse holder and a 30 amp spade blade fuse.
  • The 25' flat trailer wire harness includes a 4-way flat connector with a positive and negative cable. A fuse holder with a 30 amp fuse is provided.
  • This kit also include a 4' pigtail connector with a “claw clip” connector that has an eyelet on each end for easy connection to a reverse light or auxiliary socket.
  • A 4-Way flat ring terminal that can be used for connecting the trailer socket to the vehicle battery or for attaching a ground wire.
  • A lug with a hole for a ground wire and a factory style wiring plug for an OEM installation.
  • Each wire is factory color coded for easy installation.

6. Shoreline Marine 4-Way Trailer Wire Harness

Our rating: 9 / 10

Shoreline Marine 4-Way Trailer Wire Harness

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The Shoreline Marine 4-Way Trailer Wire Harness ​has the capability of plugging into your boat trailer's brake lights, back up 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 48265 30' 4 Wire Flat Trailer Side Y-Harness Connector

Our rating: 9 / 10

Hopkins 48265 30' 4 Wire Flat Trailer Side Y-Harness Connector

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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 inches long. It is equipped with multiple female connector openings that lets you connect them to the vehicle. These openings are 2 inches apart.

The Hopkins 4 Wiring connector is constructed of 20 gauge, tin plated steel for durability. The 4 Wiring Flat connector measures 12.5 inches long x 17/32 inch wide x 1/8 inch thick. It fits 2 inch openings and it’s compatible with 4 Wiring flat and 6 Wiring flat/4 Wiring round 7 wire connector covers.

Included with the 4 Wiring Flat connector for tow lights are various accessories and hardware. There is a red cover, a white cover, a yellow cover, a blue cover, an open cover, a 7/16 inch hex wrench, a small 4 Wiring Flat to 7/16 inch hex wrench, and an 8 wire trailer connector with a 4 wire square pigtail that you can use to connect to the vehicle.

8. Reese Towpower 85205 4-Way Bonded Trailer Wiring,Multi

Our rating: 8 / 10

Reese Towpower 85205 4-Way Bonded Trailer Wiring,Multi

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Pros:

  • 4-way connector resists corrosion
  • Installation is simplified through a factory end connector

Starting out as a manufacturer of trailer tires, Reese now has a product line-up that includes wiring harnesses.

Take for example the Reese Towpower 85205 wiring harness. This is a time-tested wiring kit with rustproof connectors that can be easily installed regardless of your skill level.

It includes a 4-way connector which allows you to attach your trailer lights to the vehicle. This, in turn, simplifies the installation process. You don’t have to worry about purchasing additional parts in order to complete the installation.

9. 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
  • Includes all the necessary hardware

Cons:

  • Some of the wires may be too long
  • Housings are plastic and may be prone to cracks

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 a 4-way flat harness.

The kit includes 18 gauge color coded wires which are rated for 80 inches and wider. That 18-gauge wire is a lot thinner than before which may cause some concern. However, some users insist that the thinner gauge wires provide additional flexibility.

Every good harness system requires the use of a trailer light. That trailer light helps with the proper functioning of the trailer’s electrical system. The kit includes a 4-way connector for the trailer lights, an in-line connector, some spare fuses, and an instruction manual.

10. CZC AUTO Trailer Wiring Harness Kit 4-Way Wishbone Style

Our rating: 8 / 10

CZC AUTO Trailer Wiring Harness Kit 4-Way Wishbone Style

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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.

If want to have this wiring harness, then you’ll be happy to know that it comes with a lot of features that should make it an ideal option for your trailer.

First off, it comes with a total of twenty-eight feet of wiring. So you can be sure that it’ll be a long enough wiring harness if you’re using a big trailer.

Frequently Asked Questions (FAQ)

What are the best boat trailer lights?

In years past, I would never want to be seen with an orange reflector. That was the standard by which all other LEDs were measured. It simply didnʼt get any better than that.

Then, something happened. I started using a lot more of the lights on the market and began to see a difference. Now, I am happy to say that there are some excellent lights out there.

New lights also have one very, very important thing in common: A decent warranty.

The competition is fierce in the LED lighting industry. That is very good news for you, the consumer. Companies need to make sure their lights are a bang for your buck.

Here are the top 5 best boat trailer wiring harnesses for your truck.

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 really want to tackle on your own. Even if you have a wiring diagram, it is almost impossible to verify once all the wires are reconnected that it is in the right order.

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 boatʼs electrical and lighting needs.

Reputable marine supply stores and boat trailer manufacturers like Tekonsha make LED boat lights for a variety of trailer lights, including clearance lights, back-up lights, safety lights, and LED boat lights for single or dual trailer lights.

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.

LED lights don’t use a filament like a traditional bulb. They instead use millions of tiny light emitting diodes to create light.

To do this, you need a couple of things like a high output voltage and a capacitor to get the light to light instantly. That is why these lights are so bright but also why they are not designed to be submerged in water.

The best LED boat lights will be rated to be safe in water and are generally made to last at least 25,000 hours.

Conclusion

Boating season is fast approaching, which pretty much means that your boat needs to be in tip-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 in order to help you make a purchase that you’ll be proud of for years to come.

Our Recommendation

NameCategoryProduct
Wesbar 707261 Wishbone Style Trailer Wiring HarnessBest OverallWesbar 707261 Wishbone Style Trailer Wiring Harness
MICTUNING Trailer Wiring Harness Extension KitBudget PickMICTUNING Trailer Wiring Harness Extension Kit
Hopkins 48265 30' 4 Wire Flat Trailer Side Y-Harness ConnectorUpgrade PickHopkins 48265 30' 4 Wire Flat Trailer Side Y-Harness Connector