The Baja Designs LP9 Sport 2-Light Max wiring harness (MPN 640175) is a splitter kit that powers a pair of LP9 Sport auxiliary lights from one switch and one set of battery connections. It is a universal 12v harness capable of powering up to 12 amps, designed for the LP9 Sport, LP6, and LP4. Owners on user forums describe the harness as including a relay alongside the switch, so you are not splicing two light leads together by hand and hoping the circuit holds up on rough trails. The harness does not offer a momentary switch option, so buyers who want momentary operation will need a different setup.
Fitment is universal, so the harness is not built for a specific vehicle; it is a matter of matching it to your aux or switch circuit. The manufacturer's install sheet says the positive ring terminal and negative ring terminal go to the battery posts, with the inline fuse on the positive lead only. From there the harness runs along the fender well toward the driver's side, the switch passes through the firewall to the instrument cluster area, and the two 4-pin Deutsch-style plugs connect to the lights. Zip-tie the run away from moving, rotating, or hot parts, and tie off the unused plug if you run only one light. Owners on user forums who wire the harness to factory aux switches report cutting it back at the lamp leads, and they warn that you should confirm the light draw stays within the circuit rating.
Owners on user forums report that the harness can be cut back to the lamp leads and wired to an existing aux circuit, since many aux systems already include their own relays and fuses. They also warn that wiring high and low beam to separate switches risks powering both at once. The manufacturer offers a separate LP9/LP6 Upfitter Lock-Out harness (SKU 640167) for sPOD, Switch-Pros, and factory upfitter setups, stating it prevents high and low circuits from receiving power at the same time.
Yes. The manufacturer's install sheet says that if you run only one light, the unused plug should be zip-tied out of the way.
Per the manufacturer's install sheet, the harness is a routing job rather than a complicated wiring job: connect the ring terminals to the battery, run the harness along the fender well and, where needed, through the firewall to the switch location, then plug in the two lights. Battery-terminal hardware for related Baja LP harnesses is typically a 10mm or ½-inch socket, so plan for that. Before you connect the battery, double-check polarity, since owners on user forums flag reversed positive and negative as a common cause of a light that will not come on. Keep the wiring away from hot, sharp, or moving parts, and check that the fuse is seated.
