Randy mckinney Posted April 2, 2014 Share Posted April 2, 2014 99 rd688 cruise quit is there any common issues or places to look first or any body have a wireing diagram. Its an e7 mack dealer says its the computer but they never had there hands on truck just a phone call Quote Link to comment Share on other sites More sharing options...
j_martell Posted April 2, 2014 Share Posted April 2, 2014 There's a few switches that would cause the cruise to quit. Clutch and brake switches come to mind. Someone with more knowledge than myself will chime in I'm sure. Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
theakerstwo Posted April 5, 2014 Share Posted April 5, 2014 .The ecm will need to be monitored with a reader. This will tell you what switches is not doing what.The VSS can be defective also.There will be two switches on the dash and a parking brake switch plus a stop light switch and a clutch switch that goes in play with it.A wiring problem as well as a module being bad can happen but only a reader will show this. Quote glenn akers Link to comment Share on other sites More sharing options...
staxx Posted April 5, 2014 Share Posted April 5, 2014 And the brake lite bulb also . Quote Link to comment Share on other sites More sharing options...
e9500v8 Posted April 27, 2014 Share Posted April 27, 2014 That's what that black knob on the left of the steering wheel is for!! Quote Link to comment Share on other sites More sharing options...
ultratruck Posted May 23, 2014 Share Posted May 23, 2014 Most of the time it is one of the cruise switches that look like brake light switches. You can bypass them to check to see if the cruise works. Quote Link to comment Share on other sites More sharing options...
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