John,
13.2 volts doesn't seem too bad.  What is the voltage when the engine is off
?  If the voltage increases, then the alternator is charging.  You might
consider taking it to an alternator repair shop to be tested.  They could
also probably identify for you which lead is which.

Steve Brooks


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of John Slade
Sent: Tuesday, March 23, 2004 10:42 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Alternator - again


Guys,
I'm getting really frustrated with my (stock 3rd gen) alternator. I'm seeing
13.2v on the buss when the engine is running, but the charge light is still
on (even with the diode).

Answers to two questions might help me debug it:

1. What voltage should I see on the buss with the engine running?

2. The picture on the schematic seems backwards to the actual alternator,
and there are no markings on the connector. Is there a way to test which
terminal is the sensor (direct to battery) and which is the idiot light?

Note: The alternator tested fine a few weeks back, but I guess I could have
fried the internal regulator since.

John Slade (coming down to the wire)


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