I have the same problem. I hve a 2005 CV713 tri-axle dump with anti-lock and ATC. The ATC is what causes the problem. I have found the air line diagram but part numbers to add the trailer lines are not there. From what I can tell, I need the Park Brake Control Module and the Tractor Protection Manifold along with assorted lines and fittings. Is there a part list somewhere for this conversion. The dealerships seem to think so but I can't get them to get off their butts and help me (Been trying for almost a year ). I'll do the work myself if I can find what parts I need. Thanks in advance.
