Posted by Bob on November 30, 2008 at 12:28:52 from (69.178.228.68):
In Reply to: 966 alternator wiring posted by markinab on November 30, 2008 at 11:55:10:
Is this the type of alternator you have... Delco 10SI/12SI?
If so, the #2 (RH in the photo) terminal is "voltage sense", and will have battery voltage at all times.
The #1 (LH) terminal is "switched excite", and will only have power when the key switch is "ON".
Instead of the diode shown in the photo, your tractor will have a resistor that accomplishes the same thing... to limit the reverse flow of current out of the alternator through the "excite" terminal. Also, the #2 wire will likely NOT be connected to the output stud, but will be connected to a point nearer to the battery for BETTER voltage sensing (although the setup shown will work just fine, and is often used in alternator conversions.
To recap... #2 always "hot", #1 only "hot" when key switch is "ON".
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