Why Start on Driver's Side Installing Tekonsha 4-Way on 2019 Jeep Grand Cherokee
Updated 02/17/2026 | Published 06/22/2024
Question:
Shanes video installing Tekonsha 118727 for Grand Cherokee 4 pin trailer wiring kit starts with connecting trailer wires to left rear tail light, then routes wiring over to right rear tail light. Is there a reason why install begins with left rear light? That awkward route requires running battery wire from converter box near LR light, forward along left side frame, then over the engine to the battery terminal on R front fender. Flipping the wiring install to begin with RR tail light would position battery wire from converter box on same side as battery for easier and cleaner install if doable. Perhaps dedicated L/R wiring plug connectors are different pins, I dont know. Asking questions for clarity in advance of getting into install work.
asked by: Robert
Expert Reply:
Hey Robert,
Good question, and the reason you start on the driver's side of your 2019 Jeep Grand Cherokee when installing the T-One Vehicle Wiring Harness # 118727 is because the wire that goes from the module to the taillight connector is longer for the passenger side connector. You couldn't switch them because of how they're pinned, like you mentioned.
Product Page this Question was Asked From
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- Powered Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Visible
- Tekonsha
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: How to Install Prodigy P3 Brake Controller 2024 Ford Maverick Hybrid
- Q&A: Trailer Wiring Harness & Brake Control Wiring for 2016 Jeep Grand Cherokee with/without Tow Package
- Article: Trailer Wiring Diagrams
- Article: My Trailer Hitch Doesn't Fit
- Q&A: 4-Way and 7-Way Bracket that Fits 2021 Jeep Grand Cherokee
- Q&A: Does etrailer & Curt Trailer Hitch for 2019 Jeep Grand Cherokee Come With Mounting Hardware
- Q&A: J-Case Fuse Position For Curt 7-Way Harness On 2024 Honda Pilot Blocked
- Q&A: How to Add a Trailer Connector to a 2018 Jeep Grand Cherokee
- Article: How to Choose the Right Trailer Hitch Class
- Article: How to Measure for Trailer Hitch Drop
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: Roadmaster Vehicle Specific Base Plates
Robin H.
2/17/2026
Hey Robert, how did things go with the wiring harness on your Grand Cherokee once you followed the driver-side start? Knowing how the routing worked out could really help others planning the same install.