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Old 12-24-2003, 03:01 PM   #1
The Hawk's Lair
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1985 34.5' Airstream 345
BACK WOODS , Minnesota
Join Date: Dec 2002
Posts: 922
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1984 motorhome cruise control

I am trying to repair the cruise control using the factory service manual. The service manual states I should have a brown control box, mine is grey, I also have two additional wires going to the control box where the service manual says there should not be any, a couple of color codes did not match either. I did check the switches located on the turnsignal lever and they work as the manual states at the control box. I am not able to follow the rest of the manual since they use a special tester and a different color control box. I am now questioning the vacuum side of the cruise. The vacuum line from the engine goes to a red 2" X 2" valve. The outlet from the valve is a smaller vacuum line than the one from the engine and it goes to the servo. There is more vacuum going to the valve then what is coming out, which is probably the reason it is not working. Is it normal to have less vacuum? What is the purpose of the valve? Could I bypass this valve to obtain more vacuum at the servo? I could use some guidance.

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Old 12-24-2003, 04:21 PM   #2
Rivet Master
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1978 31' Sovereign
Texas Airstream Harbor , Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
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Why fix it?


For $86 and a trip to an auto parts store you too can have a brand new Audiovox CCS 100 cruise control.

Don't know how much you value your time troubleshooting, but attempting a fix on a 20 year old unit without an accurate repair bible might take a while.

I opted for a new unit, enabled me to clip out some old wires and clean up the vacuum system a bit.


"Suck it up, spend the bucks, do it right the first time."

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Old 12-25-2003, 08:12 AM   #3
Rivet Master
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2004 28' Classic
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huntsville , Alabama
Join Date: Jul 2002
Posts: 866
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i have for ever kicked the wires for the cruise control off my brake pedal . or disconnected the vacuum line to the servo. i have the service manual and it isnt much help on repairing the unit and parts are not redily available. i will do as suggested replace when i reach the it needs a serious fix. it is easier to replace than fix . and probably cheeper if you find the parts.
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