











Trailer Wiring and Bracket w/ Light Tester For 05‑10 Chevy Cobalt 4 Door Inc. SS Sport 05‑06 Pontiac Pursuit Plug & Play 4‑Flat Harness
Model: 118398 118144 20114Plug and Play T-One Wiring Harness Connector
4-Flat Mounting Bracket
4-Flat Car End Tester w/ LED Display
Fits The Following Vehicles:
2005 - 2010 Chevrolet, Cobalt, 4 Dr.
2008 Chevrolet, Cobalt Sport, 4 Dr.
2005 - 2010 Chevrolet, Cobalt SS, 4 Dr.
2005 - 2006 Pontiac, Pursuit, 4 Dr. (Canada Only)
Wiring Kit Specs:
Part Number | 118398 |
Brand | Tekonsha |
Warranty | 1 Year |
Installation Instructions | ![]() |
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 |
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:
05 06 07 08 09 10 2005 2006 2007 2008 2009 2010
$60 28 $71.28 15% OFF
- 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
View products that fit your vehicle
Fits 's with the following styles:
View products that fit your vehicle
Fits 's with the following styles:
$71.28 $60 28
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 $15.00 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: 118398 118144 20114
- Includes: T-One T-Connector Custom Harness, Mounting Bracket, 4-Flat Car End Tester
Compatibility Chart
Year Range | Make | Model | Style |
---|---|---|---|
Loading... |
Plug and Play T-One Wiring Harness Connector
4-Flat Mounting Bracket
4-Flat Car End Tester w/ LED Display
Fits The Following Vehicles:
2005 - 2010 Chevrolet, Cobalt, 4 Dr.
2008 Chevrolet, Cobalt Sport, 4 Dr.
2005 - 2010 Chevrolet, Cobalt SS, 4 Dr.
2005 - 2006 Pontiac, Pursuit, 4 Dr. (Canada Only)
Wiring Kit Specs:
Part Number | 118398 |
Brand | Tekonsha |
Warranty | 1 Year |
Installation Instructions | ![]() |
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 |
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:
05 06 07 08 09 10 2005 2006 2007 2008 2009 2010
Be the first to ask a question.
Get Expert Help
Trailer Wiring and Bracket w/ Light Tester For 05-10 Chevy Cobalt 4 Door Inc. SS Sport 05-06 Pontiac Pursuit Plug & Play 4-Flat Harness Install Notes
Installation Instructions for T-Connector Adapter
Part Numbers:
- 118398
Tools Required:
- 9/32" Socket
- Philips Head Screwdriver (if needed)
- Drill with 3/32" Drill Bit (if needed)
Step-by-Step Instructions:
-
Remove Rear Taillight Assemblies:
- Open the trunk and locate the plastic wing nuts behind the taillights on both sides (1 per side). Remove them.
- Pull back the carpet on both sides to expose and remove the second set of plastic wing nuts (1 per side).
- Locate and remove the remaining taillight screws outside the vehicle near the trunk weather seal (2 screws per side). Use a 9/32" socket.
- Carefully pull the taillights away from the vehicle, ensuring the alignment pins are not damaged.
-
Connect T-Connector on Driver’s Side:
- Disconnect the vehicle’s wiring harness from the driver’s side taillight socket.
- Plug the T-Connector end with the yellow wire between the taillight socket and the vehicle wiring harness.
-
Route the T-Connector Harness:
- Route the T-Connector end with the green wire and the 4-flat connector down through the opening between the vehicle’s bumper and body.
- Route the green wire to the passenger side and the 4-flat connector under the bumper.
- Bring the green wire up through the opening on the passenger side.
- Avoid areas with hot pipes, heat shields, the fuel tank, or other points that may pinch or damage the wire.
- Repeat step 2 for the passenger side using the T-Connector end with the green wire.
-
Ground the White Wire:
- Locate a suitable grounding point near the connector (e.g., an existing ground stud). If necessary, drill a 3/32" hole.
- Secure the white wire using the provided eyelet and screw.
- Caution: Verify what is behind any surface before drilling to avoid damage or injury. Do not drill into exposed surfaces.
-
Reinstall Taillight Assemblies:
- Position the vehicle wiring harness between the taillight housing and the vehicle body.
- Reinstall the screws, plastic wing nuts, carpet, and other components removed during installation. Ensure wires are not pinched or cut.
- Secure the remaining T-Connector harness under the bumper using the provided cable ties.
-
Test the Installation:
- Test the T-Connector with a test light or trailer to verify proper functionality.
- All connections must be complete for the T-Connector to work correctly.
Specifications:
- Max. stop/turn light: 1 per side (7.5 amps).
- Max. tail lights: (7.5 amps).
Safety Notes:
- Do not exceed the towing manufacturer’s rating or the unit specifications.
- Overloading circuits can cause fires. Test the installation thoroughly to ensure proper functionality.
Manufacturer Notes:
- Follow all warnings and installation instructions provided.
- Refer to the vehicle owner’s manual for additional information.
Installation Instructions for T-Connector Adapter
Part Numbers:
- 118398
Tools Required:
- 9/32" Socket
- Philips Head Screwdriver (if needed)
- Drill with 3/32" Drill Bit (if needed)
Step-by-Step Instructions:
-
Remove Rear Taillight Assemblies:
- Open the trunk and locate the plastic wing nuts behind the taillights on both sides (1 per side). Remove them.
- Pull back the carpet on both sides to expose and remove the second set of plastic wing nuts (1 per side).
- Locate and remove the remaining taillight screws outside the vehicle near the trunk weather seal (2 screws per side) using a 9/32" socket.
- Carefully pull the taillights away from the vehicle, ensuring the alignment pins are not damaged.
-
Connect T-Connector on Driver’s Side:
- Disconnect the vehicle’s wiring harness from the driver’s side taillight socket.
- Plug the T-Connector end with the yellow wire between the taillight socket and the vehicle wiring harness.
-
Route the T-Connector Harness:
- Route the T-Connector end with the green wire and the 4-flat connector down through the opening between the vehicle’s bumper and body.
- Route the green wire to the passenger side and the 4-flat connector under the bumper.
- Bring the green wire up through the opening on the passenger side.
- Avoid areas with hot pipes, heat shields, the fuel tank, or other points that may pinch or damage the wire.
- Repeat step 2 for the passenger side using the T-Connector end with the green wire.
-
Ground the White Wire:
- Locate a suitable grounding point near the connector (e.g., an existing ground stud). If necessary, drill a 3/32" hole.
- Secure the white wire using the provided eyelet and screw.
- Caution: Verify what is behind any surface before drilling to avoid damage or injury. Do not drill into exposed surfaces.
-
Reinstall Taillight Assemblies:
- Position the vehicle wiring harness between the taillight housing and the vehicle body.
- Reinstall the screws, plastic wing nuts, carpet, and other components removed during installation. Ensure wires are not pinched or cut.
- Secure the remaining T-Connector harness under the bumper using the provided cable ties.
-
Test the Installation:
- Test the T-Connector with a test light or trailer to verify proper functionality.
- All connections must be complete for the T-Connector to work correctly.
Specifications:
- Max. Stop/Turn Light: 1 per side (7.5 amps).
- Max. Tail Lights: (7.5 amps).
Safety Notes:
- Do not exceed the towing manufacturer’s rating or the unit specifications.
- Overloading circuits can cause fires. Test the installation thoroughly to ensure proper functionality.
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.
Technical Support:
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.