Rivco 4 to 5 Wire Signal Decoder HD-007-50 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 A plug-in connection between sub-harness PART #3902-0165 and the trailer wiring isolator For use ONLY with Rivco Universal Trailer Wiring Isolator NOTE: 2014 models come equipped with a new CAN-bus style wiring and require the use of isolator, MFR #GL18007-IU.