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Old 09-17-2012, 04:12 PM   #1
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85 Southwind Cruise Control

I am hoping someone has seen one of these and knows some of the common issues they may have had with them. Or a schematic, owners manual, etc..
When I turn the cruise on with the turn signal lever control the red power led lights up on the control unit but the cruise never engages when I press the button.

Thanks....





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Old 09-18-2012, 07:15 AM   #2
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Back in the day, I don't remember these as being real reliable. We changed out a lot of servos. One common problem was tied to the brake lights. Either the chassis switch wasn't adjusted properly, or a second switch dedicated solely for use by the cruise, was installed improperly. In either case, the cruise would not work because it was being told the brakes were on....
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Old 09-18-2012, 05:00 PM   #3
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Here is a thread that I posted in RV.net a couple of years ago

RV.Net Open Roads Forum: Tech Issues: Any technical cruise control experts out there?

After reading it maybe I can answer some questions.
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Old 09-18-2012, 07:08 PM   #4
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Does this cruise use vacuum? I was thinking it was one of the early all electronic servos? Working on them was a LONG time ago!
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Old 09-18-2012, 07:11 PM   #5
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I had read something before about corrosion in the actuator. Think that will be where I look next. Hopefully that's all it is. I do have vacuum to the actuator.

Any idea what the little thumb wheel on the control unit is for? This whole system is a little strange. The control on the turn signal lever rotates to turn the unit on and off, but also can be rotated like a rheostat. I think there is a detent to set the knob somewhat in the middle. Guess maybe that it could be for varying your speed.. There is also a button on the end I'm guessing to be used to engage the unit once it has been turned on.

I don't see a speed sensor anywhere so I guess maybe they used the tach signal from the distributor.

I don't mind driving without it working but aside from my Kwikee step that breaks a different way every couple months the cruise is the only thing left that doesn't work...

Thanks for the help.....
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Old 09-18-2012, 07:13 PM   #6
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Quote:
Originally Posted by ahicks View Post
Does this cruise use vacuum? I was thinking it was one of the early all electronic servos? Working on them was a LONG time ago!
Yep.. Has a vacuum actuator with a cable connected to the carb.
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Old 09-18-2012, 07:32 PM   #7
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Mine was dead. When I found the rheostat I checked it with a meter and found it to be very erratic. I sprayed it with contact cleaner and followed it up with some lubricating spray. That was a couple of years ago and it is still working fine. The rheostat is part of the output shaft on the modulator. The shaft had a twist in it so when it went in and out it would turn the rheostat to let the electronics know where it is. It's been awhile but I believe the rubber boot just pulls off the front of the modulator.
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