Complete Harley Wiring Harness for 4-Wire Trailer

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. Simple plug-n-play installation makes it a snap to install.

This package allows you to add a four-wire trailer to your Harley without splicing wires. A four-wire trailer has shared brake/turn signals. The package includes a plug-in subharness for your bike, a 5-to-4 converter, and relay package.

The subharness on this kit fits FLHT and FLST from 1997 to current models. If you have a different model Harley or fall outside these model years, please use our Universal Relay Package.