Automotive RTL Wiring Harness Baja Designs

The Baja Designs Automotive RTL Wiring Harness (PN 640127) is built specifically to power RTL auxiliary lighting from front to rear of your vehicle — no splicing improvised wiring, no guessing on reach. This harness is long enough to run the full length of a car or truck, so you're not dealing with extension hacks or undersized stock.

What's included matters here: high-quality sheathing throughout, plus a relay that handles all three functions — running light, brake, and cargo/reverse light. That relay-driven design keeps the current load off your factory wiring and gives you a clean, protected circuit for each function.

One important callout: this harness (640127) is designed for the standard RTL. If you're running the RTL-S, you need PN 64-0130, which includes turn signal jumpers. Running the wrong harness means missing functionality — so confirm your RTL variant before ordering.

We stock this alongside the full Baja Designs RTL lineup because clean, complete wiring is what separates a professional install from a warranty headache. If you already have your RTL and just need the wiring to do it right, this is the harness to pair with it.