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Alternator/VR problem
I driven my 911 about 6,000 miles this year. It's been a blast but now it's time for some maintenance: clutch cable, fuel pump, alternator/vr, valve adjust.
About the probem: My car stalled a couple of times when pulling up to a stop. RPMs blipped down once to 500 and then 0. It started right back up, no problem. I noticed the voltmeter reading barely over 12VDC at idle with some accessories on. After RPMs increase I read ~14.5VDC. One day last week I noticed the reading change once between the 2 numbers at idle directly after startup. I let the car warmup in the driveway this morning; had the parking lights on. For the first time I noticed the lights pulsating. I may be done driving for the year with this and the other pending maintenance to be done. I have had the alt rebuilt and replaced the vr a few years ago. I'll have to pull the alt first thing, no matter what but should I buy a new alt or get it rebuilt again? Thanks, jt -84 targa 105k |
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10-23-2009, 09:28 AM
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I had this same problem a few months back. I took my voltage regulator out(internal regulator) and saw the brushes were worn down significantly. When I put in a new vr the problem was history. I think you may have the same problem because of your intermittent charging. Sometimes the brushes are making contact and sometime they aren't.
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10-23-2009, 10:47 AM
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Thanks for your reply aadrew. I concur with the voltage regulator diagnosis. The alternator appears to be charging ok. Usually when it's not you will know it pretty quickly. No warning lights are present either.
$60 isn't too bad for a new VR. I just wish it was easier to get to. jt |
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10-23-2009, 07:13 PM
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Join Date: Jul 2009
Posts: 285
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You can take the alternator out in 15 minutes. I had to take mine out about 10 times at least. First time took 2 hours, then 45 minutes, then 15 or less.
I agree its the VR. Buy one with a lifetime warranty |
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10-24-2009, 06:08 AM
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I had my alternator out, geez, maybe 7 years ago. Got it rebuilt and put a new vr in at the same time. Got it out in maybe 2 hours or so. No too bad a job, just not much space.
Where do I get a VR with lifetime warranty; here @Pelican? jt |
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10-26-2009, 05:54 AM
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1981 SC
