Tekonsha 4 Flat Connector ModuLite HD Plus Protector Trailer Wiring Harness powers your trailer's stop, turn, tail, and running lights without overloading your vehicle electrical systems. This trailer hitch wiring harness has integrated re-settable Short Circuit and Overload protection to safeguard itself and the tow vehicle from shorts and installation wiring mishaps. Advanced circuitry works in all standard applications as well as vehicles with ST and STT pulse width modulation (PWM) systems and can be used on a 2 wire or 3 wire system. This wiring harness for trailers is rated for up to 4.2 amps stop light/turn signal circuit capacity and 7.5 amps taillight circuit capacity. The tow hitch wiring harness kit includes wire, pigtail with 4-flat connector and cover, fuse, splices, comprehensive installation instructions, and more. Tekonsha offers the largest, most complete line of replacement vehicle wiring harnesses. So, what are you waiting for? Hit the road with the peace of mind only Tekonsha can provide. Life's a Journey. Stop Often.