-1000x1000.webp "Plug and Play T-One Wiring Harness Connector 4-Flat Mounting Bracket 4-Flat Car End Tester w/ LED Display 118808 118144 20114 Tekonsha Trailer Wiring and Bracket Light Tester 19-23 Mazda 3 Hatchback and Sedan Plug Play 4-Flat Harness 19 20 21 22 23 2019 2")
-150x150.webp "Plug and Play T-One Wiring Harness Connector 4-Flat Mounting Bracket 4-Flat Car End Tester w/ LED Display 118808 118144 20114 Tekonsha Trailer Wiring and Bracket Light Tester 19-23 Mazda 3 Hatchback and Sedan Plug Play 4-Flat Harness 19 20 21 22 23 2019 2")
-550x550.webp "Plug and Play T-One Wiring Harness Connector 4-Flat Mounting Bracket 4-Flat Car End Tester w/ LED Display 118808 118144 20114 Tekonsha Trailer Wiring and Bracket Light Tester 19-23 Mazda 3 Hatchback and Sedan Plug Play 4-Flat Harness 19 20 21 22 23 2019 2")
Trailer Wiring and Bracket w/ Light Tester For 19‑24 Mazda 3 Hatchback and Sedan Plug & Play 4‑Flat Harness
Model: 118808 118144 20114Includes Everything Pictured:
Plug and Play T-One Wiring Harness Connector
4-Flat Mounting Bracket
4-Flat Car End Tester w/ LED Display
Fits The Following Vehicles:
2019 - 2023 Mazda, 3, Hatchback
2019 - 2024 Mazda, 3, Sedan
2019 - 2024 Mazda, 3, All Styles
Wiring Kit Specs:
| Part Number | 118808 |
| 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
Partial list of fitment years:
19 20 21 22 23 24 2019 2020 2021 2022 2023 2024
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Product Details
- Brand: Tekonsha
- Model: 118808 118144 20114
- Includes: T-One T-Connector Custom Harness, Mounting Bracket, 4-Flat Car End Tester
Compatibility Chart
Description
Includes Everything Pictured:
Plug and Play T-One Wiring Harness Connector
4-Flat Mounting Bracket
4-Flat Car End Tester w/ LED Display
Fits The Following Vehicles:
2019 - 2023 Mazda, 3, Hatchback
2019 - 2024 Mazda, 3, Sedan
2019 - 2024 Mazda, 3, All Styles
Wiring Kit Specs:
| Part Number | 118808 |
| 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
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 Mazda 3 Hatchback and Sedan Plug & Play 4-Flat Harness Install Notes
Installation Instructions for T-One® T-Connector for Mazda 3 Sedan
Part Numbers:
- 118808
Tools Required:
- Trim Panel Remover
- 10mm Socket & Ratchet or Wrench
- Drill (3/32” Drill Bit)
- Wire Crimpers
- Wire Cutters
Step-by-Step Instructions:
-
Open the Trunk:
- Remove the threshold panel.
- Partially remove the felt trunk liner on both sides to expose the vehicle’s taillight wiring harness.
-
Connect the Driver-Side T-Connector:
- Insert the T-One® Connector end with the yellow wire between the vehicle’s wiring connectors.
- Ensure the connectors are fully inserted and the locking tabs are securely in place.
-
Mount the T-One® Black Box:
- Mount the T-One® Connector black box using the provided double-sided tape.
- Secure the remaining harness with the provided cable ties, avoiding areas where wires could be pinched or cut.
-
Ground the White Wire:
- Locate a suitable grounding point near the connector, such as an existing ground stud.
- If no existing point is available, drill a 3/32” hole and secure the white wire using the provided eyelet and screw.
- Clean the area to remove dirt or rustproofing before securing.
Caution: Verify what is behind the surface before drilling to avoid damage or injury.
-
Route the Passenger-Side T-Connector:
- Route the green wire connector along the threshold to the passenger side.
- Insert the green wire connector between the vehicle’s taillight socket and wiring harness, ensuring all connections are secure.
-
Connect the Power Wire:
- Disconnect the Negative (-) battery cable.
- Remove the fuse from the yellow fuse holder (provided).
- Attach the ring terminal to the Positive (+) battery cable and secure it.
- Connect the other end of the fuse holder to the black 12-gauge wire using the provided yellow butt connector.
Warning: Follow all warnings and precautions printed on the vehicle’s battery.
-
Reconnect the Battery and Test:
- Reconnect the Negative (-) battery cable.
- Install the 15-amp fuse into the fuse holder.
- Test the installation using a test light or trailer.
-
Reassemble the Vehicle:
- Reinstall the plastic trim panels, threshold, storage covers, and floor covering removed during installation.
- Ensure no wires are pinched or damaged.
-
Store the 4-Flat Connector:
- Route the 4-flat connector through the driver’s side trim panel into the storage compartment.
- Store the connector in the compartment when not in use.
Safety Notes:
- Overloading circuits can cause fires. Do not exceed stated product ratings.
- Always wear safety glasses and follow 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.
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