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Join Date: Mar 2010
Posts: 5
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911 2.7 charging problem
can anyone help?
my car starts fine, battery light goes out, about 20 mins later the battery light stays on until about 2200rpm at no stage does the alternator light come on or even flicker, i had the alternator reconditioned and the engineer said it was charging well on his bench, i checked with a meter it is only reading 11.8v at tick over increasing to 12.9v at 3000rpm. |
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03-13-2010, 05:51 AM
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Your voltages look too small. You should be getting more voltage out of the alternator. You could have a couple of diodes going bad.
What year is your car? Do you still have the external voltage regulator?
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Rex 1975 911s and 2012 Range Rover Sport HSE 1995 BMW R1100RS, 1948 Harley FL |
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03-13-2010, 06:00 AM
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its a 1975 with a external regulator and had one diode replaced when sent for repair
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03-13-2010, 06:14 AM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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general rule of thumb
always replace external regulator when rebuilding alternator
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-13-2010, 06:45 AM
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ttt
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03-13-2010, 10:18 PM
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ttt
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03-14-2010, 09:20 AM
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Senior Advisor
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Yup, there is your problem (most likley). The regulator does just that, regulates voltage. Try that and see what it does.
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08 Cayenne Turbo |
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03-14-2010, 09:31 AM
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i will give that a try
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03-14-2010, 10:57 AM
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1975 Porsche 911s
