Trailer Wiring and Bracket w/ Light Tester For 19‑24 Subaru Ascent Plug & Play 4‑Flat Harness
Model: 118790 118144 201144-Flat Mounting Bracket
4-Flat Car End Tester w/ LED Display
2019 - 2024 Subaru, Ascent, All Styles
Wiring Kit Specs:
| Part Number | 118790 |
| Brand | Tekonsha |
| Warranty | 1 Year |
| Installation Instructions |  |
4-Flat Mounting Bracket
| Part Number | 118144 |
| Fits | 4 Flat Connectors |
| Brand | Tow Ready |
| Mounts electrical connector to attachment bracket Includes screws and nuts Attractive point-of-purchase packaging |
|
| Warranty | 1 Year |
4-Flat Car End Tester
| Part Number | 20114 |
| Fits | 4 Flat Connectors |
| Brand | Tow Ready |
| 4-Flat Car End Tester w/LED Display Plug these testers into any car connector and you will have an instant test of running light circuits. |
|
| Warranty | 1 Year |
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: 19 20 21 22 23 24 2019 2020 2021 2022 2023 2024
$73 76
- Best Price on Web Guarantee
- Fastest Shipping
- FREE Shipping
- In Stock
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.
Verify Fitment
$73 76
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 $18.25 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.
Installments in partnership with
.
Affirm and its offerings are supported in English only. Translations are not provided by Affirm.
Product Details
- Brand: Tekonsha
- Model: 118790 118144 20114
- Includes: T-One T-Connector Custom Harness, Mounting Bracket, 4-Flat Car End Tester
Compatibility Chart
4-Flat Mounting Bracket
4-Flat Car End Tester w/ LED Display
2019 - 2024 Subaru, Ascent, All Styles
Wiring Kit Specs:
| Part Number | 118790 |
| Brand | Tekonsha |
| Warranty | 1 Year |
| Installation Instructions | |
4-Flat Mounting Bracket
| Part Number | 118144 |
| Fits | 4 Flat Connectors |
| Brand | Tow Ready |
| Mounts electrical connector to attachment bracket Includes screws and nuts Attractive point-of-purchase packaging |
|
| Warranty | 1 Year |
4-Flat Car End Tester
| Part Number | 20114 |
| Fits | 4 Flat Connectors |
| Brand | Tow Ready |
| 4-Flat Car End Tester w/LED Display Plug these testers into any car connector and you will have an instant test of running light circuits. |
|
| Warranty | 1 Year |
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: 19 20 21 22 23 24 2019 2020 2021 2022 2023 2024
Get Expert Help
Trailer Wiring and Bracket w/ Light Tester For 19-24 Subaru Ascent Plug & Play 4-Flat Harness Install Notes
Installation Instructions for T-One® T-Connector for Subaru Ascent
Part Numbers:
- 118790
Tools Required:
- Trim Panel Remover
- 10mm Socket & Ratchet or 10mm Wrench
- Drill (3/32” Drill Bit)
- 1/4” Socket
- Phillips Head Screwdriver
- Test Probe
Step-by-Step Instructions:
-
Prepare the Vehicle:
- Open the rear tailgate.
- On the driver’s side, remove the access panels, threshold, trunk floor panels, and trays.
- Set aside all items carefully to avoid damage.
-
Locate the 8-Pin Connector:
- Find the vehicle’s 8-pin connector behind the rear interior trim panel on the driver’s side.
- Insert the 8-Pin Tow-Plug Adapter into the connector and lock it securely in place.
-
Ground the White Wire:
- Using a trim panel remover, carefully pull back the interior trim panel on the driver’s side.
- Locate the existing ground stud.
- Loosen the bolt, place the screw eyelet on the stud, and retighten the bolt.
Caution: Ensure all other ground connections are secure when removing and reattaching the ground stud.
-
Test the Installation:
- Verify all connections are complete for the T-One® T-Connector to function properly.
- Use a test light or trailer to test the installation.
- For the initial test, reset the vehicle’s electrical system by temporarily removing the key from the ignition.
-
Store the 4-Flat Connector:
- Store the 4-flat connector in the rear cargo area when not in use.
Safety Notes:
- Overloading circuits can cause fires. Do not exceed the stated product ratings.
- 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.
- Always read and follow all warnings and instructions printed on the tow vehicle’s battery.
Installation Instructions for T-One® T-Connector for Various Vehicles
Part Numbers:
- 118790
Tools Required:
- Trim Panel Remover
- 10mm Socket & Ratchet or 10mm Wrench
- Drill (3/32” Drill Bit)
- 1/4” Socket
- Phillips Head Screwdriver
- Test Probe
Step-by-Step Instructions:
-
Prepare the Vehicle:
- Open the rear tailgate.
- On the driver’s side, remove the access panels, threshold, trunk floor panels, and trays.
- Set aside all items carefully to avoid damage.
-
Locate the 8-Pin Connector:
- Find the vehicle’s 8-pin connector behind the rear interior trim panel on the driver’s side.
- Insert the 8-Pin Tow-Plug Adapter into the connector and lock it securely in place.
-
Ground the White Wire:
- Using a trim panel remover, carefully pull back the interior trim panel on the driver’s side.
- Locate the existing ground stud.
- Loosen the bolt, place the screw eyelet on the stud, and retighten the bolt.
Caution: Ensure all other ground connections are secure when removing and reattaching the ground stud.
-
Test the Installation:
- Verify all connections are complete for the T-One® T-Connector to function properly.
- Use a test light or trailer to test the installation.
- For the initial test, reset the vehicle’s electrical system by temporarily removing the key from the ignition.
-
Store the 4-Flat Connector:
- Store the 4-flat connector in the rear cargo area when not in use.
Safety Notes:
- Overloading circuits can cause fires. Do not exceed the stated product ratings.
- Always wear safety glasses and follow all safety precautions during installation.
Attention: This is a summary of the installation procedure. For complete installation instructions, including diagrams and detailed information from the manufacturer, please download the full installation PDF.
Manufacturer Notes:
- Refer to the vehicle owner’s manual and the instruction sheet for additional details.
- Store these instructions for future reference.
- Always read and follow all warnings and instructions printed on the tow vehicle’s battery.
Warranty Information:
- For complete warranty instructions, please download the full installation PDF.
For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
