nstall your Hayes electric trailer brake controller quickly and easily with this custom wiring adapter. One end plugs into the controller, and the other plugs into the junction box beneath your vehicle's dash. Features: Plug-in wiring adapter allows for quick, simple installation of your electric trailer brake controller. No cutting or splicing required. Custom connector end plugs into the electric junction box beneath the dash of your vehicle. Opposite end plugs into the back of your electric brake controller. Compatible with time-delayed and proportional brake controllers from Hayes.