Hagen Brothers farms,Goodrich ND | The #1 regulator terminal is the "excite" terminal that starts the alternator charging. It must connect to power only when the ignition is on
or it will run down the battery when parked. It also needs a resistor inline in the #1 wire to limit current flow in and out of the regulator.
I prefer to use a small two wire indicator light like a 70's Ford side marker light assy. The light supply's the necessary resistance and can serve as a charge indicator if the machine does not have a voltmeter or ammeter.
The #2 regulator terminal is the "sense" terminal, which allows the regulator to sense system voltage so the alternator can maintain normal system voltage. The most common place to connect the #2 sense wire is to the big BAT stud on the alternator rear.
Make sure you use a replacement alternator plug from the auto parts store. Do not use un insulated crimp on terminals on the regulator terminals, as the #2 sense terminal is less than 1/8 inch from the alternator case. This wire is hot all the time, un fused and likely will cause an electrical fire if it shorts to the case. The replacement plug is safe, fits nice, looks nice and cost only about $2.
Edited by Jon Hagen 4/12/2009 13:10
 (Delco alternator wiring and 12V conversion.jpg)
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 Delco alternator wiring and 12V conversion.jpg (28KB - 8646 downloads)
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Wiring a GM 3 wire alternator
