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BMW Single-Wire Compatible Trailer Wiring Harness


A relay-isolation harness is a good investment if you're planning to pull a trailer. This setup allows you to drive a set of trailer lights (standard bulbs or LEDs) without affecting or loading the bike's signal circuits.

In the event that a short develops in the trailer wiring (typically in the plug area), an inline fuse in the relay package protects both the bike and trailer. Your bike's lights will remain unaffected and continue to work. This video shows the isolating kit in action:

This kit is designed specifically for mid-2000s BMWs that have a single wire system for brake and running light. The included module splits out the two signals so your trailer running and brake lights will operate independently. This is NOT required for most BMWS, including those with CAN-BUS systems. You can use the regular universal wiring kits. This is ONLY for BMWS like the R1200RT that have a single wire running to the brake/running light.

This package includes components for both four and five-wire trailer configurations. All you need to add is the appropriate bike-side receptacle for a complete, safe wiring solution.

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  • Model: TW-BMW-SWS
  • Shipping Weight: 1lbs

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