Emergency Battery Disconnect Might Have Fried My Alternator, Even Though I Wired In The Resistor Options

[motorvated]

'72 car with '75 1.8 L-Jet. Relay board has been removed and alternator is wired directly to voltage regulator. No wiring to alternator light in dash so I wired in a 12volt wire that is hot with the key to a small light in the engine compartment that is wired to the field windings of the alternator to serve as a boot strap to get the alternator to start charging. With the I gnition on, engine not running, the light is on. Crank the engine and the light goes off as it should. Got the motor running and the light stayed off. I hit the emergency shutoff switch that I wired in to test it and confirm that it stops the motor and cuts off all power, which it did. Next time I started the motor the light stayed on and no changing detected at the battery. So it looks like I might have fried my alternator by using the emergency shutoff switch. I wired the resistor that came with the shutoff switch on the downstream side of the shutoff switch as specified, and it was supposed to dump the residual current through the resistor to ground after the switch is moved to the off position and protect the alternator. Any comments or opinions on this. Did I do something wrong? Any tests I can do of the alternator to assess it's condition?