MODULITE WITH ADAPTERS. * Plugs onto any T-One or 4-Way Flat Connector. * Powers the trailerUs stop, turn and tail/running lights directly from the tow vehicleUs battery. * Virtually eliminates current draw on the vehicles taillight circuits. ModuLite HD w/ relays,up to 4.2 amps per stop/turn circuit & 7.5 amps per tail circuit.