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Registered
Join Date: Oct 2003
Posts: 3
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1911 SC Charging Problem
1981 Porsche 911 SC with an alternator that has the integrated regulator.
The original alternator was overcharging 17 volts at idle. It then stopped charging and the red warning light was coming on. I checked the voltage at the battery and could only get 12 volts at idle. I replaced it, with a rebuilt alternator. From the beginning the car idled lower and I checked the voltage at idle 12.9 volts. The car did drive fine except for lower idle, two weeks later the cars idle lowered even more and I could not drive the car out of the garage. Checked the voltage at the battery, no charging again reading 12 volts. I removed the alternator again and had it bench tested. The company says the alternator is working fine. Installed it again, and no charging. One thing I did notice is the alternator light isn’t coming on as it did before. Any expertise is appreciated |
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10-28-2003, 02:19 PM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Check the alternator light. If it doesn't come on when you turn the key, your alternator will never charge. Tons of recent threads in the archives on this.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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10-28-2003, 02:23 PM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,310
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I think the alternator-warning-light-as-part-of-the-charging-system phenomenon was specific to some of the early cars. Not sure though.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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10-28-2003, 02:35 PM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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At least through 88 and I'll check the 964.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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10-28-2003, 02:42 PM
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Registered
Join Date: Nov 2000
Location: Ashburn VA.
Posts: 667
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Post your location! there might be someone in the area that would be willing to help you.
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George My Owners Gallery Page 1983 911SC - Built July 1983 #2547 out of a total 2559 shiped to the US. in 1983. Could be the last U.S. production SC still running. 1995 BMW 525I 2001 Highlander- kid mover |
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10-28-2003, 03:03 PM
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Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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don't know if this applies to internal reg. but,
Battery terminal corrosion or old ignition switches have internal contact resistance often causing a lite "glow"........Ron
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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10-28-2003, 03:06 PM
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I'm off the hook.....
Join Date: Oct 2001
Location: 22 miles south, then 11 miles west of LAS
Posts: 2,895
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I was absolutely certain that some idiot was going to say that the 1911 SC didn't have an alternator. Or a generator for that matter.
Sure am glad some idiot didn't say that.
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No, I don't sing. Based there for too long. |
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10-28-2003, 05:00 PM
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Registered
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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The alt. light MUST come "on" with the key in the "run" position,
or the alt. will NOT "start". Good luck will your internal regulator alt. They're all less reliable than the external ones. I'd convert my '88 3.2 to an external, if it weren't such a hassle. Have Fun Loren '88 3.2
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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10-28-2003, 06:20 PM
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Registered
Join Date: Oct 2003
Posts: 3
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Checked Light
Thanks everyone for the replies.
I checked the Alt. light. The light is on when I turn the key to on position. When the car is running the light doesn't come on. My Loction is Irvine California. |
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10-29-2003, 06:38 AM
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Heck, I’m only 5 not 71!
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If your idle is to low the alternator will notoutput the correct charge. adjust your idle to spec and then check the output voltage.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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10-29-2003, 06:49 AM
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Senior Member
Join Date: Nov 2000
Location: Great NorthWest
Posts: 3,944
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Did you clean all grounds? At the battery, at the engine to chassis? They must be immaculate.
Did you bench test the battery? The battery takes a bit of a beating when it is overcharged by a flaky alt. Of course the battery terminals must also be cleaned as well. John
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'78 Targa in Minerva Blue |
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10-29-2003, 07:11 AM
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