Peter,
Some basic questions re your cruise control;
• Has is worked in the past?
• Does it work with the exhaust brake on and off? Depending on how the coach is programmed some cruise control units will not work if the exhaust brake is turned on.
• Will your check engine light come on if you push the cruise control On switch multiple times? (It should if the unit is working like the 07s).
• Does the High Idle function work? (see pg 184 of the owner’s manual). Engine running and transmission in neutral. Turn CC on and press/hold Set button. Engine RPM should increase. Press/hold Resume button and RPM should decrease.
• My CC takes a few seconds, up to 15 or so, to turn on after the On switch is pushed. It also takes a few seconds to engage after I push the Set switch.
Steve