Trailer Light Wiring Harness Kit For 18‑23 BMW X2 Direct Plug & Play

Model: 118789

This Wiring Fits The Following Vehicles:

2018 – 2023 BMW, X2, All Styles

Wiring Kit Specs:

Part Number	118789
Brand	Tekonsha
Warranty	1 Year
Installation Instructions

Questions or Comments? Call 702-374-8999

Thank you for choosing Tekonsha, the most powerful name in trailer light wiring and brake control system. Our trailer wiring harness is vehicle specific, requires no splicing or cutting of the wires. Simply plug & play and your vehicle will be able to control trailers brake, turn and running lights. Trailer wiring kit comes with a 1 year warranty and everything necessary to install the trailer plug wiring. Tekonsha manufactures a wider range of different products for hooking up trailer lights to your Car Truck or SUV. T-One connectors work great with boat trailer wiring and utility trailer wiring. Typically those trailers will use the standard 4 flat plug which is what our T One connectors offer. If you have an RV Fifth Wheel or any other large type of trailer you will us a 7 pin trailer plug to control your electric trailer brakes. Tekonsha offers 7 pin trailer connector as well. Simply do a search above to see if there is a 7 wire trailer wiring available for hooking up your 7 way. If there is not you can use part number 85343 trailer wiring adapter to convert any 4-Flat into a 7-Way. In addition you will use part number 20506 which will include the rest of wiring needed for electric brake controls. You can also call us or email us any time and we will be able to provide information you need.

Partial list of fitment years: 18 19 20 21 22 23 2018 2019 2020 2021 2022 2023

See Full Description

$86 ³⁰ $124.43 31% OFF

Best Price on Web Guarantee
Fastest Shipping
FREE Shipping
In Stock

Best Price on Web Guarantee

We match lower prices from major authorized retailers for brand-new products in original packaging, provided the item is in stock. The competing seller must be an authorized, professional retail business; offers from individuals, auctions, peer-to-peer sites, or unauthorized sellers don’t qualify. Used, refurbished, or open-box items are excluded.

Please see our full terms for details.

Applies to this product only

Please wait...

Verify Fitment

Year

Make

Model

Add to Wish List

$124.43 $86 ³⁰

Pay in 4 interest-free installments of $21.50 with

Learn more

Questions? Call our Auto Experts at (877) 869-6690

Get it now, pay later

Select installments at checkout to split your purchase into 4 interest-free payments of $21.50 every 2 weeks.

No fees, ever.
No impact on your credit score.

Payment options are offered by Affirm and are subject to an eligibility check and might not be available in all states. CA Residents: Loans by Affirm Loan Services, LLC are made or arranged pursuant to a California Finance Lender license.

Fits Vehicle Styles

Product Details

Brand: Tekonsha
Model: 118789
UPC: 016118151739
Includes: T-One T-Connector Custom Harness

Compatibility Chart

Specification
Circuit Protected	Yes
Hardware Included	Yes
Harness Type	4-Way Flat (Vehicle Side)
Terminal Quantity	4
Universal Or Specific Fit	Specific Fit
Wire Colors	Brown, Green, Yellow, White
Wire Quantity	4 Wires

Be the first to ask a question.

Description

This Wiring Fits The Following Vehicles:

2018 – 2023 BMW, X2, All Styles

Wiring Kit Specs:

Part Number	118789
Brand	Tekonsha
Warranty	1 Year
Installation Instructions

Questions or Comments? Call 702-374-8999

Tags: 118789 , 2018 , 2019 , 2020 , 2021 , 2022 , 2023 , 18 , 19 , 20 , 21 , 22 , 23 , BMW , X2 , Tekonsha , Trailer , Wiring , Harness

Get Expert Help

Trailer Light Wiring Harness Kit For 18-23 BMW X2 Direct Plug & Play Install Notes

Installation Instructions for T-One® T-Connector for BMW X2

Part Numbers:

118789

Tools Required:

Trim Panel Remover
10mm Socket & Ratchet or 10mm Wrench
Drill (3/32” Drill Bit)
1/4” Socket
Wire Crimpers
Wire Cutters
Phillips Head Screwdriver
Test Probe

Step-by-Step Instructions:

Remove the Taillight Assemblies:
- Open the tailgate and carefully pry the black taillight trim cover using a trim panel remover to expose the two 10mm taillight fasteners on the driver’s side.
- Remove the two 10mm screws on both driver and passenger sides.
- Gently pull the taillights away from the vehicle, being cautious not to damage the alignment pins. Set the taillight housings aside.
Locate the Taillight Wiring Harness:
- On both sides of the vehicle, locate the taillight wiring harness.
- Disconnect the wiring connectors carefully, ensuring not to break the locking tabs. Ensure all connectors are clean and free of dirt.
Mount the T-One® Black Box:
- Determine a suitable mounting point behind the rear bumper fascia on the driver’s side.
- Mount the black box module using the provided double-sided tape.
- Ensure the trailer wire harness has adequate length to reach this point.
Warning: Mount the module with the epoxy side facing downward to prevent water accumulation.
Connect the Driver-Side T-Connector:
- Route the T-Connector end with the yellow wires through the bumper and vehicle body into the driver-side taillight pocket.
- Insert the T-Connector end with the yellow wire between the driver-side taillight socket and the vehicle wiring harness.
Route the Passenger-Side T-Connector:
- Route the T-Connector end with the green wire underneath the bumper to the passenger side.
- Insert the green wire end through the passenger-side opening and connect it between the taillight socket and the vehicle wiring harness.
- Avoid hot pipes, heat shields, or areas that may pinch or damage the wires.
Ground the White Wire:
- Locate a suitable grounding point near the connector, such as the vehicle frame or crossmember.
- Clean the area of dirt and rustproofing.
- Drill a 3/32” hole and secure the white wire using the provided eyelet and screw.
Caution: Verify what is behind the surface before drilling to prevent damage or injury.
Route the Power Wire:
- Locate the black 12-gauge power wire from the T-One® Connector box.
- Attach the provided black wire and route it along the exterior frame or follow existing wiring to the vehicle’s battery.
- Avoid areas that may pinch, cut, or break the wire.
Connect to the Vehicle Battery:
- Disconnect the Negative (-) battery cable.
- Remove the fuse from the yellow fuse holder and attach the ring terminal to the Positive (+) battery cable.
- Connect the other end of the fuse holder to the black 12-gauge wire using the yellow butt connector.
Warning: Follow all warnings and cautions printed on the tow vehicle’s battery.
Reconnect the Battery and Test:
- Reconnect the Negative (-) battery cable.
- Insert the 15-amp fuse into the fuse holder.
- Test the installation using a test light or trailer.
Secure the Wiring Harness:
- Use the provided cable ties to secure the harness, avoiding areas that may pinch, cut, or melt the wires.
Reassemble the Vehicle:
- Replace all panels and components removed during installation, ensuring no wires are pinched or damaged.
Store the 4-Flat Connector:
- Route the 4-flat harness underneath and to the center of the vehicle.
- Mount the 4-flat end in an accessible location using a bracket or electrical box (not included).

Safety Notes:

Overloading circuits can cause fires. Do not exceed stated product ratings or vehicle manufacturer specifications.
Always wear safety glasses and follow all safety precautions during installation.

Manufacturer Notes:

Refer to the vehicle owner’s manual and the instruction sheet for additional details.
Store these instructions for future reference.