alternator question
 

The charging system of my '82 930 is acting up after recently after finding a stuck brush in the alternator. I was able to carefully pry it out and though all seemed well.

The car has the Paris Rhone internal alternator (3 wires). I see the alternator light on startup (as expected) and the car starts without issue. Idle voltage is 13.5 or so. The light extinquished after starting.

Problem is if I turn the key off the car will run on. If I pull the blue wire to the alternator light, the car stops as usual. I assumed a bad internal voltage regulator but pulled the gauge only to find what I think is a bad factory inline diode located at the alternator light.

When measuring continuity, it will pass electricity from both directions. This makes the run on understandable. A cheapie radio shack diode that I had laying around, installed in place of the bad factory one, returns everthing back to normal.

2 questions:

1) the dying of the inline diode seems too coincidental considering I just messead around with the alternator. Do these things ever burn out?

2)If so, any though on voltage/amperage specification for the replacement diode? I'm too cheap to spring for the factory part of $20.00 when radio shack is down the street.


Thanks

vin

Monday morning bump.

Thanks