The Baja Designs LP4 Series Upfitter Harness - Single Light (MPN 640188) is a wiring harness that connects one LP4 auxiliary light to an upfitter circuit without splicing directly into the vehicle's wiring. The manufacturer built this harness to work with sPOD, Switch-Pros and factory upfitter systems. Its ground input, backlight tap, low beam tap and high beam tap are all broken out separately. Owners on user forums have described re-working a standard harness to reach an aux switch, which required cutting away the relay and fuse section.
The LP4 is the smallest variant in the LP lineup, which makes it a common choice for A-pillar and ditch-light mounts. Owners on user forums have run the harness under the cowl and between the fender toward the A-pillar on late-model Ford trucks. The manufacturer classifies this harness as universal, so verify your switch source and mounting location before ordering. The LP9, LP6 and LP4 are rated for 12 to 36 volts.
If you run an sPOD or Switch-Pros panel and want LP4 high beam, low beam and amber backlight on separate switch positions, this single-light lead is the starting point for that setup. If you also want a high and low lock-out, the manufacturer points to a separate 640167 harness. Searches for LP4 single light upfitter harness, LP4 sPOD wiring and Switch-Pros LP4 high low backlight tap usually lead to this part.
No. The manufacturer lists the harness without a switch and without mounting hardware, so you will need a compatible power module or factory upfitter switch to control the light.
The manufacturer states that a high and low lock-out for the LP series requires the separate 640167 harness. This 640188 harness on its own provides the individual tap inputs.
The manufacturer lists Deutsch connectors as the terminal type for this harness.
The manufacturer classifies it as universal rather than built for a particular vehicle. Fitment depends on the switch or power module you use and where the light is mounted. Owners on user forums have installed LP4 lights on several truck and Jeep platforms using upfitter-style wiring.
Plan on a moderate wiring job rather than a plug-and-play swap, since the harness ships without a switch or mounting hardware. Disconnect the battery before tapping any circuit, and use the manufacturer's 640188 installation sheet as your reference for each tap connection. Before cutting any factory wire, test the upfitter circuit with a multimeter or test light, and plan the lead route before you commit to a location. One forum member noted that a power module like sPOD already includes its own relay, switch and fuse, which can reduce the work on the power side.
