1. Custom Fit Vehicle Wiring
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  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118808
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Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118808 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (2)
  • Q & A (3)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118808

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

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


  • 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
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located in the rear cargo area. You will have to remove the threshold panel and corner felt trunk liner to access this harness.

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.

Once installation is complete, the 4-way flat connector will be stowed in your rear cargo area.

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.

ModuLite Powered Tail Light Converter

A ModuLite power module is built into this T-One 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 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.

118808 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118808 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118808

Average Customer Rating:  5.0 out of 5 stars   (2 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

- 118808
2020 Mazda CX-30

Great product, excellent customer service! Would recommend to anyone looking for a trailer hitch and harness. 884638

- 118808
2019 Mazda 3

This was the only plug and play harness I found at the time for my car, but so far I'm very pleased. Due to amount of technology and sensitive electronics in these new cars, I wouldn't want to try to probe a bunch of wires and connect a standard trailer light kit. The voltage and current with the LED tail lights might not even trigger a standard kit. This kit made it much easier, although it's much more involved as you have to remove a bunch of panels, and run power to it. It's great that absolutely no wires were cut or tapped, and no holes needed to be drilled. Couple of install notes: * The instructions are for a sedan, but I installed it on a hatchback where you have to remove a few more panels. Nothing too complicated, but take your time and look for all the fasteners. The plug for the right rear is a little more involved as it's behind a few more things. * The rear hatch weather stripping has to be pulled away in a few areas. It's got a sealant underneath it that is easy to get everywhere, so remove the stripping slowly and try not to make a mess - it sticks to everything. * Instead of running to the battery, I used an add-a-tap fuse connection at the drivers kick panel fuse block. I used a 15amp fuse just like the package came with. * I taped the module in the left rear area under the taillight where you ground it to a factory ground point near by. 737869


Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Tips for Routing Power Wire of Trailer Wiring Kit for 2019 Mazda 3
    When routing the power wire of the Tekonsha trailer wiring kit part # 118808 to the vehicle's positive battery post we don't have an exact route you'll need to take for your 2019 Mazda 3 but I can help steer you in the right direction. Basically you want to route it up to the front of the vehicle from underneath it securing it with the included zip ties avoiding anything hot (exhaust) and moving components (suspension). I attached a help article on routing the power wire for you to...
    view full answer...
  • Hitch Recommendation and Cargo Carrier For 2020 Mazda 3 Hatchback
    I recommend the Draw-Tite Class I SportFrame hitch part # 24984 which will fit the 2020 Mazda 3 without drilling and will give you a 1-1/4" receiver opening for a cargo carrier or other accessories like a bike rack. The hitch is rated for 200 lbs of tongue weight in the cargo carrier so you do not want to exceed the tongue weight of the hitch. For a cargo carrier I recommend Class I Surco Cargo Carrier part # 52017 which will provide you with 48" long x 20" wide of usable space in the...
    view full answer...
  • Which Hitch Fits 2019 Mazda 3 Hatchback All Wheel Drive
    Yes the Draw Tite hitch part # 24984 does fit the all wheel drive models of the 2019 Mazda Hatchback like you have! We had a customer with your exact vehicle leave us a review letting us know if fit perfectly as well which I attached a picture of. If you were in need of trailer wiring as well the correct fit is the part # 118808. This kit installs easily and has a very reliable converter box so it will last a long time!
    view full answer...

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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Jameson C
Updated by:
Sarah W
Updated by:
Isabelle B
Written by:
Alexander C

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