I have a Friend that has taken a Mercedes out of a Western Star and replaced it with a 60 Series Detroit. If I remember right the truck is a 2005. Does anyone know if Western Star got into multiplex wiring. There are 29 wires in the Detroit harness and 19 in the Western Star harness. Also there is some type of controller or converter behind the steering wheel in the dash that I have no idea what it would be for, unless it is something that is connected to the Mercedes.