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Cruise Control issues [message #107037] Mon, 29 November 2010 12:18 Go to previous message
Carl S. is currently offline  Carl S.   United States
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma:
Senior Member
My original cruise control stopped working and I need some help diagnosing the problem. On our way to the GMCSJ rally in Benson last month, I was cruising down I-10, with the cruise engaged, when my engine died. After getting safely off the road and running through a few diagnostic steps, I determined that I had no spark. I installed the spare ignition module that I carry, the engine started right up, and we were back on the road in less than 15 minutes.

Once I got back up to speed, I hit the cruise control switch and it would not engage. It has been intermittent ever since I bought the coach two and a half years ago, so I didn't think much about it. In Benson, I replaced the ignition module with a new one and, while I was in there, thinking I had inadvertently pulled a wire loose on the cruise control, checked the wiring connections on the cruise unit. I had previously grounded the cruise control directly to the engine, at Ken Burton's suggestion, which had helped with the intermittence problem. All seemed well yet the cruise would not engage on the trip home either.

Before leaving on my annual sand dune trip over Thanksgiving weekend, I re-checked the electrical connections, took the lower dash panel off and checked the switch at the brake pedal (which I assume is some sort of device that temporarily breaks the vacuum to the cruise control when you hit the brake). It looked OK physically, and I adjusted it a little closer to the stop on the pedal arm. I still didn't have any cruise control for the whole trip down there.

On the way home, I stopped in Yuma and checked under the hatch again as well as replaced the fuse (which looked OK, and apparently was). None of this fixed it. I would like to fix this as I want to spend my next set of GMC units on a new final drive with a limited slip differential instead of a Rostra cruise control (I know, there is a huge price difference and I probably should look at the Rostra as a 'nickle and dime' item)

I guess my next step is to look in the repair manual, but I thought I would bring this up here first.Thanks for any help you guys can give me on this one.

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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