Automotive RTL Wiring Harness Baja Designs

The Baja Designs Automotive RTL Wiring Harness (PN 640127) is built to power RTL auxiliary lighting with a single, purpose-made solution — no improvised extensions, no spliced-together runs. The harness is engineered long enough to route from front to rear, and the high-quality sheathing protects the entire run from abrasion and heat.

What sets this harness apart is the included relay. It handles all three functions — running light, brake, and cargo/reverse light — keeping the current load off your factory wiring and giving each circuit proper, protected power. That relay-driven design is the difference between a clean install and one that creates electrical headaches down the road.

One callout before ordering: PN 640127 is designed specifically for the standard RTL. If you're running the RTL-S, you need PN 64-0130 instead — that harness adds the turn signal jumpers the RTL-S requires. Running the wrong harness means missing functionality, so confirm your RTL variant first.

We stock this alongside the full Baja Designs RTL lineup because proper wiring is what separates a professional result from a problem waiting to happen. If you have your RTL and need the wiring done right, this is the harness to pair with it.