Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector

Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector

Item # 22550

lowest price pledge


Our Price: $109.95

You Save: $62.00

This item qualifies for Free Shipping

Shipping Weight: 5 lbs

In Stock, Ships Today
Wiring 22550 - 7 Blade - Tekonsha
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
Please enter a valid email address.

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.

pop out icon replay 360 icon
horizontal rotate icon

Product Images


  • Trailer Connectors
  • Vehicle End Connector
  • 7 Blade
  • Plug and Lead
  • Tekonsha
Install a 7-way, RV-style trailer connector on your vehicle with this easy-to-splice harness. ModuLite draws power directly from the battery to avoid overloading your vehicle's circuits. Brake controller wiring harness included. Lowest Prices for the best wiring from Tekonsha. Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector part number 22550 can be ordered online at etrailer.com or call 800-298-8924 for expert service.

  • All Info
  • Reviews (6)
  • Q & A (15)
  • Videos (1)
  • Photos
  • Why etrailer?

Tekonsha Wiring - 22550

Install a 7-way, RV-style trailer connector on your vehicle with this easy-to-splice harness. ModuLite draws power directly from the battery to avoid overloading your vehicle's circuits. Brake controller wiring harness included.


  • Provides a 7-way, blade-style trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 4-pole, 5-pole, and 6-pole adapters (sold separately)
  • Splices into vehicle wiring
  • Ensures that your vehicle's wiring matches that of your trailer with included ModuLite
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Includes harness with 4-pin connection point for plugging in a brake controller wiring adapter (sold separately)
  • Supplies required fuses, wire taps, and additional hardware
  • Constructed of 16-gauge bonded wire


  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty

ModuLite Powered Tail Light Converter

A ModuLite power module is built into this wiring harness. Because most trailers run on a 2-wire system - wherein the brake and turn signals are carried on 1 wire - the separate brake and turn signals from your vehicle's 3-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine 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.

With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.

22550 Tekonsha Universal 7-Way Tow Harness with ModuLite

22550 Installation InstructionsInstallation Details 22550 Installation instructions

California residents: click here

Video of Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Tekonsha Wiring - Trailer Connectors - 22550 Review

Speaker 1: Today, we're taking a look at the Universal Seven-Way ModuLite wiring harness and brake controller harness. Now this kit will provide this seven-way blade-style trailer connector at the back of your vehicle, to power your trailer signal lights. It is compatible with four-pole, five-pole, and six-pole adapters that we do sell separately on our website. This kit does splice into your vehicle wiring. The ModuLite right here, this black box, this ensures that your vehicle's wiring will match that of your trailer. It is a powered module, connects directly to your battery, and that's to avoid overloading your vehicle's electrical system.

Also includes the harness right here, that has the four-pin connection point for plugging in your brake controller wiring adapter.This kit will include everything laid out here on the table, the body harness, the seven-way harness with the seven-way socket, the brake control wiring harness, all the fuse holders with required fuses to install it, wire taps, butt connectors, cable ties, and some additional installation hardware, and even gives you a nice set of detailed instructions that'll describe how to install it with pictures.Now the wire, it's constructed of a 16 gauge bonded wire. Few specs on this kit. The maximum amperage on the stop and turn light circuits is 4.2 amps per circuit, and on the tail lights, it's 7.5 amps per circuit.That should do it for the review on the Universal Seven-Way ModuLite wiring harness and brake controller harness.

Customer Reviews

Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector - 22550

Average Customer Rating:  4.8 out of 5 stars   (6 Customer Reviews)

Install a 7-way, RV-style trailer connector on your vehicle with this easy-to-splice harness. ModuLite draws power directly from the battery to avoid overloading your vehicle's circuits. Brake controller wiring harness included.

- 22550

Worked as described. Directions were spot on. Easy install 486157


The product and electronics are working fine. Disappointed in the finish of the actual hitch. It has rusted. The rear trailer interface has Rusted and the powder coat is chipping. I need to remove it and get it replated as it stands out against the paint. This should not happen after just about a year.

Marc - 03/18/2019


- 22550

Excellent product, I like to use the eltrailer products! Also, the etrailer service is the best. Thank you so much! 527472

- 22550

Product was great. Good quality wiring. Everything needed to install on my truck. Socket for the plug is great quality. Will be another for my other truck when needed. 525772

- 22550

I wired this up myself with no previous experience. I took my time, planned out the job, and went good and slow because I didn't want to have to troubleshoot something that I knew little about. Because of my painfully slow speed and constant double-checking, the job took me a big part of the day, but it went together without any problems. I used heat-shrink butt connectors, and then after shrinking, I coated with liquid black electric tape. Have had zero problems. Directions were pretty good, although I had to google a thing or two that weren't clear enough for this rookie. Good product!!! 341754

- 22550

Installed on my 1973 Dodge W200 to allow pulling trailers. I equip my trailers only with 7-way RV plugs to make life easier: no fiddling around with different connectors. I don't like trailer wiring faults to blow tow vehicle fuses and trailer faults are far more common than TV faults. This is the best retrofit kit I found. Pro: 1. relatively complete kit, 2. fairly easy to install for anyone with basic auto electrical skills, 3. wires plenty long Room for improvement: 1. should have a larger wire for 12V battery power (pin 4) any circuit fused for 30A should have at least 10AWG Cu wire; 2. brakes should be on a self-resetting circuit breaker vs. the supplied fuse (if the fuse blows in an emergency, you're sunk. A self-resetting CB will give you a chance to recover.) 3. No bracket supplied for the 7-way socket and none of the local parts houses had any that would substitute. I fabricated my own. Bottom line, my brakes work fine, the lights light up, and the breakaway brake battery gets charged. However, I hesitate using it to keep my camp trailer battery up, due to the light wire. 443908

- 22550

excellent built wiring harness 654682


Ask the Experts about this Tekonsha Wiring
Do you have a question about this Wiring?

  • Will the Tekonsha Replacement Vehicle Wiring Harness Fit a 2018 Dodge Durango W/O Trailer Wiring
  • The Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter part # TK22113 is specifically designed to be used with a 2018 Dodge Durango that did not come with trailer wiring. The harness offers almost an entirely plug and play installation that will not require you to splice any wires. If you also need a brake controller I recommend using the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 as this is our top of the line best selling brake controller. The...
    view full answer...

  • 7-Way and Easy to Install Brake Controller for 2005 Dodge Dakota
  • The 7-way kit part # 22550 could work for you to give you a functional 7-way but there's an easier way that's more plug and play for your 2005 Dodge Dakota. So you have to start with a 4-way which for that we have the custom fit Curt kit part # 55323 which is a confirmed fit and installs easily by plugging inline with your taillight connectors. Next you'll need to convert this to a 7-way which I have a really easy solution for that as well. So the easiest to install brake controller...
    view full answer...

  • Towing Setup for a 2017 Subaru Outback Wagon
  • According to my research, your 2017 Subaru Outback Wagon has a max towing capacity of 1,000 lbs if the trailer does not have brakes or 2,700 lbs if the trailer does have brakes. You can improve the towing performance/efficiency of your vehicle with a transmission cooler like part # D13503 but you cannot increase it's capacity. The tongue weight rating of 200 lbs is correct but I cannot recommend you go over this. In order to set your Outback up for towing a trailer with brakes you will...
    view full answer...

  • Recommended 7-way Trailer Connector Wiring and Brake Controller for 2017 Isuzu NRP HD Box Truck
  • For your 2017 Isuzu NRP HD box truck, I recommend the Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector # 22550. This harness will give you all the wiring you need and then you will simply need to add the brake controller. I recommend the Tekonsha Prodigy P3 # 90195 which will connect directly to this wiring harness. I've attached the installation details to assist.
    view full answer...

  • Recommended Best 7-Way Connector Mounting Bracket for Universal Fit
  • For the Universal Wiring Harness w/ ModuLite and Brake Controller Harness - 7-Way Trailer Connector # 22550, I recommend the Mounting Bracket and Installation Hardware # PK12711U. You may also be interested in the No-Drill Mount Bracket, Short # 18140 or long # C57202. Another option is the bracket that attaches to a 2 inch receiver # C58000 if you prefer that style.
    view full answer...

  • Adding a 7-Way Trailer Connector and Brake Controller on a 2002 Toyota Tundra
  • Universal trailer wiring harness with brake controller harness # 22550 is a universal fit type of item so there are no vehicle specific installation instructions. I have included a link to the instructions that it does have for you. Another option is to install a 4-Way first, # 118378, on your 2002 Toyota Tundra. Then you can install 4 and 7-Way installation kit # ETBC7 which will allow you to hardwire in a brake controller. I have included some links that explain and show the ETBC7...
    view full answer...

  • How Long is the Wiring of the Truck Bed 7-way Harness # 22550
  • I spoke with my contact at Tekonsha and he said that the part # 22550 has plenty of wire for your long bed 2003 Dodge Ram 3500 long bed. This harness has 25 feet of wire from module to lead of wire to battery, 7 feet of wire from module to 7 pin connector, 6 feet of wiring from module to passenger side wiring and 14 feet of wire to go from module to driver side.
    view full answer...

  • Will the Universal Wiring Harness # 22550 Fit on a 1985 Ford F-250
  • It sounds like you have a short somewhere on your trailer stop/turn circuits on your 1985 Ford F-250. The Universal Wiring Harness # 22550 will fit your pickup and provide you with the connector needed for a brake controller like the Prodigy P2 # 90885 if that is the route you are wanting to take. You can also check to make sure your current 7-Way connector is clean and free of debris as well as making sure your turn/stop circuits on your pickup don't have any shorts. By searching along...
    view full answer...

  • Towing a Trailer with 7-Way RV Style Connector with a Semi-Truck with a Semi Style 7-Way
  • The 7-Way on a semi-truck is not the same as an RV style 7-Way and there isn't an adapter. What I recommend, instead of replacing the connector on the trailer, is to add the correct mating 7-Way on the truck. To do that you can hardwire in a 7-Way, # HM47210. For this 7-Way the white wire is ground, yellow is left turn signal and brake lights, green is right turn signal and brake lights, brown is the tail light wire, red is auxiliary power, blue is output to electric brakes, and purple...
    view full answer...

  • Wiring to Add to Fifth Wheel Trailer to Double Tow
  • For wiring you would not want to use Harness # 22550; instead you will want to use 7-Way Molded Trailer Plug with Junction Box # 277-000141 on your second trailer, using 10 Gauge Wire # 10-1-1 to run from the junction box to your brakes. On the rear of your fifth wheel you are going to want to use 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring # HM40975-11998 as a way to connect the two trailers. I attached a picture showing which functions on your toy hauler...
    view full answer...

  • Can Factory Tow Package Wiring and TIPM Error be Bypassed on a 2006 Dodge Ram 2500
  • Since the Modulite included with hardwire kit # 22550 connects to the vehicle tail light wiring it would bypass any issues related to the tow package wiring from the factory on your 2006 Dodge Ram.
    view full answer...

  • Universal Trailer Wiring Harness For 1998 Range Rover
  • The Universal Wiring Harness w/ ModuLite and Brake Controller Harness, part # 22550 is designed as a hardwire kit that pretty much includes everything you need to install a 7-way trailer connector on your Range Rover. The module protects your vehicle wiring and gets its power right from the battery instead of drawing power through the vehicle wiring which means no stress on the vehicle wiring. I recommend using a circuit tester like part # 40376 and test the wires on your vehicle to...
    view full answer...

  • Replacement 7-Way Wiring and Breakaway Kit for Hurst Trailer
  • If you just want to replace the trailer's 7-way blade-type wiring (but not all of its lights) you can do this most easily with a 7-way junction box like # 277-000141 or # ET7WK, both of which include a 7-way plug and cord. Kit # ET7WK also includes the necessary butt connectors and ring terminals, and wire loom too, so this will be the easier option. We also offer complete trailer breakaway systems, like the Hopkins Engager # 20099, that will activate your electric brakes in the event...
    view full answer...

  • Lunette Ring Tow Bar Recommendation for Flat Towing 2004 Chevy Silverado
  • For a tow bar we have the Roadmaster Stowmaster part # RM-583 which has a 6k capacity and uses a 3 inch Lunette ring. So then for a base plate kit you'd want the part # 3115-1 for if you have a 1500HD, 2500HD, or 3500HD. If you have a 1500LD Z71 you'd want the part # 199-5 or part # 199-10 for if you have a 1500LD that's not a Z71. For lighting you can use the diode kit, # RM-15267, and not have to worry about cutting into the taillight housing. This will splice into your taillight...
    view full answer...

  • Will Wiring Harness Activate Rear View Camera
  • The Universal Wiring Harness w/ ModuLite and Brake Controller Harness # 22550 you recently installed will not send a signal to a rear view camera system; these systems activate off of 12 volt power and are triggered via its own 12 volt power circuit. In regards to the backup camera, we do have the parts you need, the Rear View Safety Backup Camera # RVS-770 along with the Rear View Safety Camera Extension Cable - 33' Long - Male/Female Connection # RVS-104N. These two parts will give...
    view full answer...

Do you have a question about this Wiring?

  • Why etrailer.com?

    At etrailer.com we guarantee:

  • Highest quality 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 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

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

Info for this part was:

Written by:
Lindsey S
Expert Research:
Michael H
Installed by:
Jeff D
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Laura H
Expert Research:
Jeffrey L
Photos by:
Zach O
Updated by:
Alexander C

At etrailer.com 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. Let us know if anything is missing or if you have any questions.