This replaces the OEM rear subharness that sends power to the turn signals, taillight, and plate light. It has extra running and brake wires that run to each turn signal when the bike has signals that support running/brake/turns all in one. Included is all the needed crimp-on OEM turn signal connectors, taillight connector (with plugs in case you choose to eliminate your taillight), and a connector for a plate light (in cases of an aftermarket light that needs to be connected to the subharness).
To install, unplug the OEM subharness where it connects under your seat area and then remove it all, many times disassembly of the rear fender is required due to the size of the connectors and how they are fed through the fender supports. Feed the new subharness in and plug it into where the OEM subharness was. Crimp the supplied connector terminals onto each of the wires for your new signals/plate/taillight, put the terminals into the correct positions on each of the connectors and plug everything in.