Tekonsha 119147 ModuLite HD Protector Trailer Light Power Module Uses a direct connection to the tow vehicle's battery to power the trailer's stop, turn, tail and running lights without overloading the vehicle's electrical system Use when: trailer has more than 1 light assembly per side and is equipped with multiple clearance or running lights; if tow vehicle may tow a variety of trailers; if tow vehicle has 'lamp out' sensors Integrated, re-settable short circuit and overload protection - safeguards itself and the tow vehicle from shorts and wiring installation mishaps For vehicles with pulse width modulation (PWM) taillights, ensuring full brightness of the trailer lights; use on 2 or 3 wire systems; works with LED and/or incandescent bulbs (vehicle & trailer) Rated at up to 4.2 amps for turn/stop circuits and 7.5 amps for the taillight circuit; includes pigtail with 4-flat connector and cover along with wire for battery; comprehensive instructions