I'm looking for an OBDII port on my 1999 American Dream, but I can't find one. Is my coach too old to have one? It has a Spartan Chassis with a 330 HP Cummins ISC engine.
No, it is not too old. Look in the engine compartment. Right side of rig just below body. On rear radiator, it is mounted on some one the support. I am not sure, but I don't think it is a true OBD connector!