alternator

Using a 1 wire GM type alternator the voltage regulator isn't needed. You can leave it where it its as a placeholder or as stated above remove it altogether.
 
Leave it and connect the alt. one wire to batt terminal on the regulator so current will flow throught the ampmeter as the generator would.....
 
Purchasing an Alternator: The diodes used in Alternators to control voltage can be unreliable. Rebuilds typically come from China. I bought two in a row that had bad diodes which allowed higher than allowed voltage. Best to have your local electrical shop check a new or used one. They can last a long time. Might be a reasonable idea to buy an older one thru a salvage place and test it.
 
Replacement diodes might not be good. I can't speak to that. However, I point out that diodes in alternators DO NOT control voltage.
 
According to google's auto intelligence guy---


"In alternator voltage regulation, a Zener diode acts as a voltage reference, providing a stable voltage to control the output of the alternator, typically by triggering a transistor to regulate the field current"
 
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