For use with:  Wakespeed WS500 Advanced Alternator Regulator Includes: Cable with RJ45 to RJ45 connectors (black shrouds, but cable colour may vary) Pinout:   CAN-H:  pin 1;     CAN-L:  pin 2 Select one of the length options otherwise advise Solar 4 RVs what length you require and we will make to your exact length