| Re: Speedo question [message #186963] |
Thu, 11 October 2012 14:43  |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
Karma: 1
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While were on the subject, what steps should be taken to find out why my cruise control doesn't work. All I've done so far is verify that I have a good ground as someone once suggested.
I see I can buy a new transducer, but other than the obvious, how do I know its bad? Thanks
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| Re: [GMCnet] Speedo question [message #187000 is a reply to message #186963] |
Fri, 12 October 2012 07:26  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Check the vacuum lines and the dump switch on th brake pedal bracket. If the dump valve is open or broken it won't work... and if there's no vacuum to the transducer it won't work. Beyond that, a rebuild is probably in order.
--johnny
'76 23' transmode norris
'76 palm beach.
From: R.D. Hart <regor5556@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Thursday, October 11, 2012 3:43 PM
Subject: Re: [GMCnet] Speedo question
While were on the subject, what steps should be taken to find out why my cruise control doesn't work. All I've done so far is verify that I have a good ground as someone once suggested.
I see I can buy a new transducer, but other than the obvious, how do I know its bad? Thanks
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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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| Re: Speedo question [message #187024 is a reply to message #186963] |
Fri, 12 October 2012 11:24 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| biggreen wrote on Thu, 11 October 2012 12:43 |
While were on the subject, what steps should be taken to find out why my cruise control doesn't work. All I've done so far is verify that I have a good ground as someone once suggested.
I see I can buy a new transducer, but other than the obvious, how do I know its bad? Thanks
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I had several issues with my cruise control. First, it was intermittent. At Ken B's suggestion, I ran a ground directly to the rear of the left head. That helped. Next, I tore a hole in the servo (the round black thing with a rubber diaphragm that operates the throttle) while doing a hasty roadside ignition module change out. Got a good used one from Jim K. Fixed that. Next I replaced the transducer with a Jim K. rebuilt unit. Now it was nice and steady after making a few adjustments to the vacuum nipple. Next, the stalk mounted switch gave up. I borrowed a known good one from my mechanic friend for diagnostic purposes and verified that it was bad. I mentioned this on the Net and Jim Decheine came through with one for me (for free) that he removed from his '73. Now, it finally works perfectly.
Probably a lot more hassle that just replacing it with a modern Rostra, but a lot cheaper and it it works satisfactorily.
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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| Re: Speedo question [message #187026 is a reply to message #187024] |
Fri, 12 October 2012 11:27 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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| Carl S. wrote on Fri, 12 October 2012 09:24 |
| biggreen wrote on Thu, 11 October 2012 12:43 |
While were on the subject, what steps should be taken to find out why my cruise control doesn't work. All I've done so far is verify that I have a good ground as someone once suggested.
I see I can buy a new transducer, but other than the obvious, how do I know its bad? Thanks
|
I had several issues with my cruise control. First, it was intermittent. At Ken B's suggestion, I ran a ground directly to the rear of the left head. That helped. Next, I tore a hole in the servo (the round black thing with a rubber diaphragm that operates the throttle) while doing a hasty roadside ignition module change out. Got a good used one from Jim K. Fixed that. Next I replaced the transducer with a Jim K. rebuilt unit. Now it was nice and steady after making a few adjustments to the vacuum nipple. Next, the stalk mounted switch gave up. I borrowed a known good one from my mechanic friend for diagnostic purposes and verified that it was bad. I mentioned this on the Net and Jim Decheine came through with one for me (for free) that he removed from his '73. Now, it finally works perfectly.
Probably a lot more hassle that just replacing it with a modern Rostra, but a lot cheaper and it it works satisfactorily.
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To add to the above, it seems like every time I am under the hatch for something I knock a vacuum line off of one of the cruise control connections, usually the servo. I have learned to check those connections now, every time, right before I close the hatch. I suppose I could just put a better clamp on the hoses to prevent this from happening.
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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