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 4 2020, 03:13 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 |
Alternator had broken diodes. Service replaced the diode pack with a checkout. Installed the alternator this morning - all systems go with steady 14.6 volts.
Lessons learned: 1) our 911 engines from the early/mid 70's through the 80's do not have a diode behind the alternator light gauge, 2) the three wires attached to the alternator need to be insulated well to avoid grounding (in my case the small blue wire may have ground out at the alternator where it is difficult to see in the final stages of remounting the alternator to the engine, and 3) agree with Kent, these 911 alternators can generally be repaired for much less than buying a new or even refurbished unit. Now ready for Saturday's Tour (IMG:style_emoticons/default/driving.gif) |
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