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Glutton for punishment
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Another cruise control thread - 83SC cruise problems
Guys,
I know this has been discussed to death here but I've read through EVERY single thread that contains anything related to the cruise system and haven't found anything close to what I'm experiencing. Hopefully there's somebody out there that has been down this road before that can shed a little light on the problem for me. Here's what I got: 83SC with a completely inoperative cruise system. I've been through this system from front to rear several times now, and this is what I come up with: The schematic and the troubleshooting chart (Table C) in the Bentley manual don't jive. The second step in the chart shows that depressing the clutch pedal should result in a reading of 10 ohms between pin 3 and ground, but the schematic shows that depressing the clutch should merely ground the tempostat relay and interrupt the circuit on pin 3 between the cruise amp and the servo. In checking pin 3, I do NOT have 10 ohms to ground when pressing the clutch pedal, but I DO have an interruption in the circuit back to the servo. When checking resistance between pins 3 and 7 I have @15 ohms (this is the resistance of the servo and the wiring back to it), and it goes to open when the clutch is depressed. So by my logic, checking the circuit this way verifies that 1) the servo has the correct resistance, 2) the wiring back to it is indeed good, 3) the clutch switch and tempostat relay are working as they should. So:
I'm at the end of my rope with this car and I'm literally about ready to push it outside with the keys in it, hoping that some poor sucker will steal it. |
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10-29-2013, 11:11 AM
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Registered
Join Date: Feb 2013
Location: Texas Hill Country
Posts: 121
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I just went through the same thing. I even went so far as to waste the time pulling the console and clutch switch in the tunnel. I now know way more than I want to know but that was not the issue. To your point, if the relay clicks when you push the clutch, I think the circuit is fine regardless of the Bentley manual.
I did find one thing on mine that could have been an issue. I pulled the cap off the connector at the cruise control. All 10 contacts fell out but one of them was broken. I resoldered it and corrected that issue. I feel 90% confident its the brain and I sent mine off yesterday. The guy claims multiple components get replaced - 16 I think. It seems this is the likely cause. I can tell you for sure next week when I get it back.
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1985 Coupe, Rennshift, SW chip, 7/9s, LSD |
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10-29-2013, 11:19 AM
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Go-Kart Mozart
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From memory I think you are correct. It's been a while but I recall going through the same steps. Mine ended up being the CC controller itself. Bought a used controller and it worked like a champ for about two weeks and then the replacement went dead.
Pelican will arange for service of the CC controller and there is an eBay vendor out of TN that will rebuild the CC for like $80-90. I exchanged emails couple of days ago with another Pelican who just sent his off. Waiting to hear back how it turns out. Scuttlebutt is capacitors dry up over time. eBay vendor claims to replace more than a dozen parts on the circuit board. -J LOL...inthedoghouse beat me to it. I just could remember his Pelican screen name.
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86 Carrera Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken |
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10-29-2013, 11:23 AM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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Cc
Quote:
Every time it has been the CC controler. Most likely, a solder joint. Do a search on CC repairs, as there are several sources that will resolve your issue. Good luck, Gerry
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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10-29-2013, 11:41 AM
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