Big Dog Mack Posted December 20, 2019 Share Posted December 20, 2019 I have searched the internet I read all kind of forums and blogs I have no diagram and the ones I find don't look right. My cruise control and engine brake are not working I checked the fuse panels they all look good I have an automatic 2010 pinnacle MP8, CXU 613 I believe are the numbers someone please help I just need the location or something to look at where to look I own this truck and just trying to get by, so taking it to an expensive mechanic is kind of out of the question right now. I hold 45,000 lb the other day and without that engine brake I was flying! Anyway thank you for anyting any idea where to look. Quote Link to comment https://www.bigmacktrucks.com/topic/60247-cruise-and-engine-brake-out/ Share on other sites More sharing options...
JoeH Posted December 25, 2019 Share Posted December 25, 2019 Can't help you, but on Allison automatics you can set the max allowed gear with the arrow buttons. A must with an automatic when driving steep downgrades. Just keep your speed down and use the snub brake technique til you find the problem, don't want anyone killed. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60247-cruise-and-engine-brake-out/#findComment-438819 Share on other sites More sharing options...
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