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| Re: [GMCnet] Factory Cruise. Any way to test? [message #220159 is a reply to message #220128] |
Tue, 27 August 2013 23:04   |
bhayes
Messages: 263
Registered: March 2010
Karma: 1
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| A Hamilto wrote on Tue, 27 August 2013 14:54 |
| BobDunahugh wrote on Tue, 27 August 2013 15:27 |
Can a multi meter be used to test why it's not working? 78 GMC. Thanks, Bob Dunahugh GMCMI Member
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I just took a quick look at the Maintenance Manual. The Cruise Control section in my 73 manual starts on page 12-31. Figure 46 is a troubleshooting guide. CC Electrical System Check Out begins on page 12-38, and references figure 48 on page 12-39. There are some things that can be checked with a VOM (multi meter).
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Interesting. I've been having issues with my cruise control. It was working intermittently, but now it just plain doesn't work. In comparing the vacuum hose routing in Figure 53 to mine, the vacuum hose that feeds the transducer is coming directly off of the carburetor and not the vacuum "christmas tree." (There are still three vacuum lines that connect to the tree, but one of them is routed down towards the passenger side wheel well--still need to see what it connects to.)
Generally, the wiring and vacuum lines in my engine bay are kind of a mess and need to be better organized. That's GMC Project #120583^14. 
Bryan Hayes
'76 Eleganza II
Salt Lake City, Utah
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| Re: [GMCnet] Factory Cruise. Any way to test? [message #220162 is a reply to message #220159] |
Wed, 28 August 2013 01:46 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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I have two suggestions for your cruise control.
First go to the transducer and find the ground wire. Remove it from the body of the coach, extend the wire, and attach it to the engine block.
Second move the vacuum source to the port on the center rear of the intake manifold behind (not on) the carb.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Factory Cruise. Any way to test? [message #220171 is a reply to message #220124] |
Wed, 28 August 2013 08:23 |
Wander Inn
Messages: 100
Registered: January 2010
Location: Phoenix Az.
Karma: 0
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Bob;
The trouble with my GMC, the electric switch at brake
brake pedal was out of adjustment. Also the vacuum
switch on brake pedal would not hold a vacuum.
Replaced the vacuum switch and ajusted the electric
switch. Works like new.
Mike
Mike & Chris Hughes
1977 Kingsley
Phoenix, Az.
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| Re: [GMCnet] Factory Cruise. Any way to test? [message #220195 is a reply to message #220124] |
Wed, 28 August 2013 10:22 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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You cabn check to make sure power is being applied, and that the brake 'dump' switch is working. Check also the brake vacuum dump, they fail and the line gets old and cracked and leaks. Past that, do as my PO did, swap the module for a rebuild from Applied or Jim Bounds.
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On Tue, 8/27/13, Bob Dunahugh <yenko108@hotmail.com> wrote:
Subject: [GMCnet] Factory Cruise. Any way to test?
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Date: Tuesday, August 27, 2013, 8:27 PM
Can a multi meter be used to test why
it's not working? 78 GMC. Thanks, Bob
Dunahugh GMCMI Member
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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