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NEED INFO ON CRUISE CONTROL SYSTEM FOR 1978 CHEVY VAN #318580
August 14th 2009 10:01 am
August 14th 2009 10:01 am
Joined: Aug 2009
Posts: 585
Ann Arbor, Michigan
soundhd Offline OP
addict
soundhd  Offline OP
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Joined: Aug 2009
Posts: 585
Ann Arbor, Michigan
Just purchased a 1978 Chevy G20 Short wheel base van. Runs great. Cruise control does not seem to work. Has the activation button in the end of the turn signal lever. Trim tag mounted on the inside of hood does not list cruise control (don't know if it is included with a "package" or not. I have a 1972 Olds 442 and I have a cruise control system for that car (have not installed it yet) but it has a on/off switch that mounts on the dash and a control box that mounts unde the hood and a vacume/control diafram that connects to the carb linkage and it moves the linkage back & forth...etc....anyway I am trying ti find out what all is supposed to be installed under the hood for a 1978 chevy van cruise control system so I can check to see if it is all there. Any help will be appreciated. Thanks

Re: NEED INFO ON CRUISE CONTROL SYSTEM FOR 1978 CHEVY VAN [Re: soundhd] #318586
August 14th 2009 10:14 am
August 14th 2009 10:14 am
Joined: Aug 2005
Posts: 230
Thamesford, Ontario, Canada
Boopvanner Offline
enthusiast
Boopvanner  Offline
enthusiast
Joined: Aug 2005
Posts: 230
Thamesford, Ontario, Canada
The signal lever might have been replaced with a cruise control lever...
Look in the engine compartment for a servo unit(drivers side behind the carb...big bulky thing) or look for a wiring plug long and flat with about 6 ish wires going to it just sitting around...
If you don't have either of these your van is not wired for cruise and an after market one will have to be used or rewire your van with a factory wiring harness out of a van with cruise....
Not worth the hassle...aftermarket ones suck


Dave(Boopvanner)Maddalena
http://www.vandomain.com
[Linked Image]
Re: NEED INFO ON CRUISE CONTROL SYSTEM FOR 1978 CHEVY VAN [Re: Boopvanner] #318602
August 14th 2009 10:49 am
August 14th 2009 10:49 am
Joined: Feb 2001
Posts: 3,055
Insane Asylum
Lordmodelbuilder Offline

LOST SOUL
Lordmodelbuilder  Offline

LOST SOUL
Joined: Feb 2001
Posts: 3,055
Insane Asylum
Here's what should be on the engine if you have factory cruise control. 1st pic is the actuator & 2nd pic is the transducer. There will be 2 speedo cables hooked up to the transducer.
There will also be a vacuum switch under the dash near the brake pedal arm. Hope this helps. Brad [Linked Image] [Linked Image]

Re: NEED INFO ON CRUISE CONTROL SYSTEM FOR 1978 CHEVY VAN [Re: Lordmodelbuilder] #319164
August 16th 2009 9:09 pm
August 16th 2009 9:09 pm
Joined: Aug 2009
Posts: 585
Ann Arbor, Michigan
soundhd Offline OP
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soundhd  Offline OP
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Joined: Aug 2009
Posts: 585
Ann Arbor, Michigan
Thank for the info. Will take a look at it later this week.

Re: NEED INFO ON CRUISE CONTROL SYSTEM FOR 1978 CHEVY VAN [Re: soundhd] #754199
November 17th 2019 7:08 am
November 17th 2019 7:08 am
Joined: Nov 2019
Posts: 29
Sarasota Florida
G
GeneralBob Offline
newbie
GeneralBob  Offline
newbie
G
Joined: Nov 2019
Posts: 29
Sarasota Florida
I fixed mine in a 1977 shorty Chevy , had to replace both speedo cable and the transducer , servo was good . You can check the servo by unplugging the vacuum line and holding your finger over the vacuum tube while pushing the carb side of the servo into the servo . If it holds vacuum it’s good . There are no wires to my servo just a vacuum line . The only wires are to the transducer and it is a 2 wire plug in , 3 wire if you have a light in the dash . I found a guy that rebuilds transducers on eBay , they are all the same in Chevy,s so finding one is possible . That’s really where my problem was .


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