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Thanks guys. Michael, I do have the guide. I had asked the paint shop if they knew of a company that can take a look at it for me of which they had a good recommendation. I reached out the the referred guy and they do not know how to work on these engines. I guess this will be my first experience of repairs or lack of from an outside shop. I'll dinker with it when I get home. For now, no more mountains until then. (This never worked from the getgo) Coach speeds up quickly on descends and stabbing the brakes every now and then to slow her down still heats them up to the point I feel shuddering. Arizona has really long stretches of descending grades when coming from the 40 and heading back south.

Jakes on a DDEC engine are a fairly simple circuit. There is just two solenoids, one on each engine bank. First stage jakes activates one bank and second stage activates both banks. Many times vibrations will loosen the connection to the solenoid on the jake unit itself. That is usually the first thing I check. I will usually use a 12v source and connect it directly to the wire feeding the jakes. Finding this wire on the DDEC engines can be a bit more challenging, it’s almost easier just to pull the rocker covers off and just check the wiring and also just run a jumper to the solenoid and verify the solenoids are operating properly.