bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Hopkins
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 33355
lowest price pledge
Our Price: $52.56
You Save: 38%
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Orders above $99 qualify for Free Shipping
Shipping Weight: 0.68 lbs
In Stock
Hopkins Powered Converter Custom Fit Vehicle Wiring - 33355
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required. 1-833-496-1390 to order Hopkins custom fit vehicle wiring part number 33355 or order online at Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (13)
  • Q & A (0)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - 33355

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Hopkins

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing
    • Locate connection points behind rear bumper
    • Plug in connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections


  • Maximum amperage:
    • Turn lights: 2.1 amps per circuit
  • Wire gauge: 16
  • 90-Day limited warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind your rear bumper, on the driver's side and passenger's side.

Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

Tail Light Converter

A tail light converter is built into this T-connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

43355 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details 33355 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 33355

Average Customer Rating:  4.8 out of 5 stars   (13 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required.

by: 03/02/2021

This worked perfectly! Since Toyota decided that no towing package was necessary on the Tacoma SR, etrailer did what Toyota should do from the factory. They made it easy for me to add the wiring.


Came in early and fit like it was oem. I will always use E-Trailer as my go to source for parts.

2006 Toyota Tacoma

I just installed on my truck, it took me about 20 minutes. very professional product. looks like factory install minus the wiring loom, however it does have fiber wrap where it matters which is an important detail. now I don't have to worry about shorts in my wiring since you don't have to slice and splice, which ain't so nice. My only regret is that I didn't include in my order a mounting bracket which is $3-$5 which would have really buttoned up the project nicely. (this should be a suggested purchase when ordering these kits). As far as e-trailer... I got the product FAST! No Damage! Everything included! 2THUMBS UP. The only improvement I could suggest is 4 more zip ties included. you wouldn't need anything else.

2007 Toyota Tacoma

Delivery was timely and product was the correct item ordered. I appreciated the easily accessed shipping status. I have not installed the wiring harness yet, but anticipate it will fit as stated. Ill keep you informed.
Thanks for the great service and competitive pricing.

2008 Toyota Tacoma

Really easy to install. Just one thing... All of the wires in the harness are well wrapped and protected except one green wire that runs the full width of the vehicle. I went to NAPA and got some spiral wrap to protect it. Other than that, it works great. Took me 30 minutes to install, not counting the spiral wrap.


worked perfectly


Great service ,well informed about product & knowledgeable


Sold truck





1997 Toyota T100 Pickup


See what our Experts say about this Hopkins Custom Fit Vehicle Wiring

  • Does Hopkins Trailer Wiring Harness 33355 Fit a 2016 Toyota Tacoma
    I have a trailer wiring solution for your 2016 Toyota Tacoma, but the Hopkins no longer is listed for Tacomas newer than 2008. You instead would want the Curt harness part # C56282.
    view full answer...
  • Wiring Adapter for Boat Trailer With 5 Flat Plug
    There is a solution for you to use both your 4-way and 5-way connectors on your 2007 Toyota Tacoma though it is not a quick plug-in option. Instead, you would need to use the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036 which will change the 4 flat on your Tacoma to a 5 flat, though you would still be able to use the 4-way on your trailer by simply plugging it into the 5-way. I've added a link to a video review as well as a link to a video install for you to take a look at.
    view full answer...
  • Recommended Wiring Harness for 2008 Toyota Tacoma to Connect to Boat Trailer
    It sounds like you are needing a 4-Way or 5-Way flat connector on your 2008 Toyota Tacoma to connect with your boat trailer. If you do not yet have any connector installed, I recommend the Hopkins Plug-In Simple Wiring Harness # 33355. This custom harness will plug into factory ports located behind the rear bumper (on the driver and passenger side). This will provide you with a 4-Way flat connector. If your boat trailer is equipped with a 5-Way connector, then you can simply add an...
    view full answer...
  • How to Troubleshoot Turn Signals on Trailer Not Working
    The # 33355 trailer wiring harness you purchased receives its ground connection from its connection to the vehicle, it doesn't need a separate ground connection. The easiest way to test the harness would be to try plugging another trailer into the vehicle, then try another vehicle with the trailer. This will immediately tell you where the problem lies. If this isn't possible, I'll walk you through some troubleshooting strategies. When you have trailer lights acting up, the first thing...
    view full answer...
  • Trailer Wiring Harness for a 2016 Toyota Tacoma SR5
    The trailer wiring harness options for the 2016 Toyota Tacoma right now are all hardwire installations, since the truck is still a very new model, so that excludes # 33355. But you can use the ZCI harness # 119250KIT to avoid having to cut and splice into the vehicle tail light wiring.
    view full answer...
  • Upgrading Toyota Tacoma from 4-way Flat to 7-way Round Trailer Connector
    Sounds like you are looking for a 7-way for a brake controller and a 12v hot lead for your 2008 Toyota Tacoma, so I would recommend the Universal Installation Kit for Trailer Brake Controller, part # ETBC7. This includes everything needed to install the wiring for the 7-way connector, once you have the 4-Way installed. I have included a couple of videos of part # ETBC7 for you to check out. Although we offer many different brake controllers, I would recommend a proportional-type controller...
    view full answer...
  • What Would I Need to Wire a Prodigy Brake Controller # 90185 to my 2005 Toyota Tacoma Prerunner
    The connector you found could be the brake controller wiring harness If your 2005 Toyota Tacoma Prerunner has the factory tow package. If so, then you will have to use the Toyota connector that should have came in your vehicles glove box to connect from your Prodigy Brake Controller - Proportional, part # 90185, to your 2005 Toyota Tacoma Prerunner. If you are missing this connector you will need to go to a Toyota dealership to track one down. I would also recommend having them look at...
    view full answer...
  • How to get 12 Volt Power to a 7-Way on a 2003 Toyota Tacoma
    If you already have your 4-way flat in place you can simply get your 12V power by running a wire to your battery through a circuit breaker. We have 2 kits pre made for this exact situation. If you are not using a brake controller you can use 7-Way RV Upgrade Kit part # ETBC7L if you do intend on using a brake controller then Universal Installation Kit for Trailer Brake Controller part # ETBC7 is the way you want to go. Both kits will have the 7-way, circuit breaker and wiring you'll...
    view full answer...

  • Why

    At we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.

Product Experts Available Now!
Call 1-833-496-1390