Theoretical and far fetched, if these 2 resistor that magnetize the field coil for correct polarity are burned, Build in starter relay coil could substitute this, but .........I recon it was someone in a hurry
Correct, connecting to A, starter will not engage while engine running. Assuming your car is still positive grounded, starter button switched minus to starter relay (not solenoid). Other side of relay is connected to A on Gen and acts as a ground to energize solenoid for start. When engine is running and charging, A becomes hot (minus) . Minus on both sides of starter relay will disable it. Chrysler where smart.