I have a 2008 kenworth multiplex dash swapped the sdp out for a 6nz used the sdp truck side wiring harness on the 6nz, everything works as it should except no jakes, also will say the truck is an automatic any help is appreciated greatly
Never tried it with a Cat. I know a Cummins swap that went sideways like that though. Their problem was the multiplex truck and engine run all the control for the Jake and Cruise on 1 wire and the CM870 didn’t like that. Sounds like you may be against something similar
