The Baja Designs 640122 is a universal wiring harness for the brand's S8 light bars and OnX6/Hybrid/Laser series lights, including IR-series lamps. It pairs an on/off toggle for the main lights with a mode switch for the backlight or secondary function. Heavy-duty wire, a relay, an inline fuse, and battery ring terminals come in one kit, so you avoid piecing together a generic harness and hoping the gauge and protection match your light bar's draw. Its 100-inch run from the battery to the three-pin weatherpack plug is built for bumper or roof mounting, which makes it a practical choice for a clean, factory-style install.
Searchers looking for a Baja Designs S8 dual-mode harness, S8 backlight switch wiring, or a 100 inch light bar relay harness will find this kit matches those needs. It is a good fit for owners who want the backlight or dimming mode without buying a separate add-on. Mounting hardware is not included, so plan to supply your own brackets and fasteners for the relay and switch panel.
The manufacturer lists mounting hardware as not included, so you will need to supply your own fasteners and switch-panel hardware. The install sheet shows the relay mounted to an existing bolt roughly 1.5 feet from the battery.
The manufacturer lists the application as the OnX6/Hybrid/Laser/S8 series, and its install sheet is titled for S8 and OnX6 Laser lights. Confirm your specific light model with the manufacturer before ordering.
The manufacturer's install sheet calls for a 10mm or 1/2-inch socket for the battery terminals and 1/2-inch and 3/4-inch drill bits for the switch mounting holes. Park the vehicle, turn it off, and disconnect the battery ground before starting. Route the light plug lead through the engine bay to the light bar, mount the relay near the battery, and drill the switch holes at your chosen dash location. Before removing switch terminals, photograph their wire orientation, and pull on the terminals rather than the wires. Finally, reconnect the positive and negative battery leads, reattach the ground cable, and tie all wiring away from hot, sharp, or moving components. Owners on user forums note that the switch wiring is where most confusion occurs, so check the color and pin layout against the install sheet before powering up.
