Coil n' Wrap 7-Pin Plug Trailer Wiring Circuit Tester 006-114 02-0236

It is compactible with 7 pin RV plug. The safety plug aspect allows clearance lights to illuminate, also signals and brake lights to blink on the rig when in a breakdown situation on the side of the road. The lightcheck is designed to allow you to do a walk around & check the trailer or 5th wheel lights before heading down the road.