Rivco TO Wire Signal Decoder A must-have for trailers with a 5-wire system separates the combined CAN-bus signal allowing it to correctly operate lights on trailers. Features new wiring that combines brake and turn signal functions together on a single wire from a computer module to lights. Features Plug-and-play installation Requires no cutting, splicing or soldering Prevents damage to your factory wiring Decodes modern 4-wire CAN-bus signal and coverts it to a 5-wire trailer wiring system Works with Rivco wiring components