Assume you have a 10-SI. The two wire connector....
Pin 2 from the Batt (The regulator uses this voltage signal to control the field)
Pin 1 Don't know about your 580 Case but a typical installation is as follows: Batt to key switch, to one leg of the idiot light. The other leg of the idiot light to pin 1. (pin 1 is used as initial excitation for the fields thru the idiot light)
For a test, via a jumper wire, put batt voltage in on Pin 1. It should initially excite the fields. Once initially excited, the alt should have output and be self exciting via the diode trio. Stop the unit? You will have to excite again.......
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