Actually I thought they did not supply exhaust brakes for autos because at low RPM, while torque converter was still locked, the transmission was not supplying enough holding pressure for the transmission clutches and the clutches slipping were burning up.
I had a Jake brake on my 06 manual (I bought it from Cummins in 05). I don't recall how the electrical system worked but I do recall it was hooked to the ECU. I think it was foot off the throttle plus a couple seconds for the rail pressure to drop.
I do remember the vacuum pump died around 15,000 miles, which I recall Cumming replaced under warranty. New pump has a new part number that superseded old pump. The replacement was still going strong at 60K when I sold it to my Brother.
on that truck I also got a clutch switch from Cummins, that had a ground wire that went to a pin on ECU, and it allowed me to have the Dodge dealer enable the high idle you set with cruise switches.
and to the original post, yes I believe that a loose cable can cause all kinds of issues in electric controlled trucks.
