The Baja Designs Squadron Dual Sport Dimmer (MPN 660087) is a universal motorcycle wiring harness for the Squadron Sport auxiliary LED light used in the brand's dual-sport kits. Baja Designs is based in California, and this harness includes a switch, so the brightness control arrives as a complete unit. The Squadron Sport it controls is rated by the manufacturer at 3,162 raw lumens at 30W, and dialing that output back is useful when auxiliary lights are too bright or have too wide of a lighting pattern for daytime or tight trail and road conditions.
Compared with running the light at full output or improvising a control, this harness is built around the manufacturer's own dimming design. The manufacturer says it lets riders program multiple intensity levels for street applications, which suits pavement riding where full brightness is overkill. Owners note that they needed the dimmer to make the connections on the Squadron Sport, so pairing it with the light at purchase avoids a second order. Search terms this part matches include Squadron Sport dimmer harness, Baja Designs 660087, dual sport auxiliary LED dimmer switch, and motorcycle headlight dimmer for dual sport kit.
The manufacturer states that this dimmer harness works for the Squadron Sport light only. It is not listed for the Squadron Pro or other Baja Designs pods.
According to the manufacturer's specifications, a switch is included, but mounting hardware is not. Plan to reuse your existing bracketry or source hardware separately.
The manufacturer's install manual for the Squadron Sport dual-sport replacement kit walks through removing the stock headlight and brackets, unplugging the existing headlight adapter, plugging in the supplied adapter, and remounting the headlight. The parts list calls out M4 and M6 fasteners plus nyloc nuts, so have metric sockets and hex keys ready. Two gotchas: the supplied adapter will only power the light in the high beam position, and simulating high/low requires part number 63-9208 needs to be purchased separately. If you run into clearance issues, the manual points to part number 12-0015.