The Baja Designs Universal XL Linkable Wiring Harness, 6 XLs (MPN 640190), is an extension harness for adding lights to an XL Linkable light bar setup, with six XL plugs. The manufacturer says its 3- to 6-plug harnesses are the same for XL Sport and XL Pro bars, so you can set bar length without buying a model-specific harness. Owners on user forums who have run aftermarket six-light harnesses with a single thin ground report that the wiring gets warm once every light is on, which is a good reason to keep runs short and feed the circuit properly.
Choose this harness over a hand-built splice when you want an extension sized to the manufacturer's own linkable system, rather than guessing at connector pinouts and wire gauge. The manufacturer's published information I found does not state a wiring capacity or amperage rating for this harness, so confirm total load with Baja Designs before adding lights to a single circuit. Searches for XL Linkable 6 light harness, XL Pro and XL Sport extension wiring, and Baja Designs 640190 fitment match this part.
The manufacturer states that the 3- to 6-plug harnesses are the same for XL Sport and XL Pro models. Details vary across sources on this point, so confirm compatibility with Baja Designs before ordering.
Yes. The manufacturer specifies that the 7- to 9-plug harnesses are specific to each model, XL Sport or XL Pro, so a seven-light or larger build requires that model-specific harness.
Owners on user forums generally recommend running high-current light circuits through a relay with a direct battery connection, using the dash or upfitter switch only as a low-amp trigger. Confirm your wiring approach with the manufacturer for your specific build.
This is a plug-in extension, so most of the work is routing and power rather than connector fitting. The manufacturer's harness instructions for a related XL harness call for disconnecting the battery ground first and using a 10mm or 1/2-inch socket on the battery terminal hardware. Route the wiring away from heat, sharp edges, and moving parts, and secure loose wire with zip ties. The light bar itself must use the pre-load mechanisms the manufacturer specifies for your vehicle application.
