My system has a cutout relay only... I need to find out the original GM number since I have an aftermarket unit and I don't know how good it is. If I am not mistaken, I believe that between the relay and the light switch the voltage is controlled... I have not tested the generator output at maximum cruise speed, which is 2,500 rpm for me (35 MPH)... I do know that the generator is a 23 amp unit. I popped the rear band off the other day and the brushes are about 50% and the armature was fairly clean... Truthfully, I just don't know enough about these systems without a voltage regulator to determine if it is in tip top shape...
