Alternator light on? |
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Alternator light on? |
914Toy |
May 30 2020, 01:19 PM
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#1
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Senior Member Group: Members Posts: 717 Joined: 12-November 17 From: Laguna beach Member No.: 21,596 Region Association: Southern California |
My alternator light comes on with ignition on, and stays on with engine running, and voltage stays at 12V regardless of rpm's. Was charging regularly at nearly 14V. The fan belt is in good order at spec tension. The alternator was reconditioned a couple of years ago and now has about 5,000 miles on it. The diode behind the gauge was also replaced, but I have had the gauge in and out a few times working on other issues - possibly damaging it(?)
Before removing the alternator for testing, could the diode behind the gauge be faulty preventing charging? If so, what is the spec of these diodes? Your suggestions will be welcome. |
914Toy |
Jun 2 2020, 07:15 PM
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#2
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Senior Member Group: Members Posts: 717 Joined: 12-November 17 From: Laguna beach Member No.: 21,596 Region Association: Southern California |
I have replaced the voltage regulator with a new one from PP on my 2.7 L 911 engine. After a light sanding clean of the two slip rings to mate with he voltage regulator carbon brushes, I installed the new regulator back onto the alternator. I started the engine and reved it up to about 2000 rpm - unfortunately - still no charge, with the warning light remaining on red and the voltmeter showing slightly over 12V - the battery voltage. The regulator is the $100 Valeo 5 star rated unit on PP which they say is the same as Porsche uses, but it is made in China (?).
After looking at a few "how to trouble shoot Alternators" videos, and checking all connections and correct attachment of the three wires to the alternator, I have to conclude that the alternator has failed. Subject to any further advice from this brain trust I plan to remove the alternator again tomorrow and take it for a professional checking. |
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