Basically what's happening is that when starter solenoid is energized, power to the starter (from the solenoid) also goes to the cutout relay I added (bottom right). That opens the power wire to the regulator, killing the field current going to the rotor. Result is the 2.5 amp power to the alternator is interrupted when the starter is energized. Two and a half amps saved.... and no magnetic field at the rotor that the starter has to work against. More amps available to the starter (especially with a marginal/low battery) and the starter doesn't have to work harder against the magnetic field in the alternator. Until I test it, I won't know how much it helps, but in a marginal situation (low battery) I think it will help quiet a bit.