Posted by Heat Houser on May 23, 2012 at 10:22:13 from (69.66.35.73):
In Reply to: Farmall B Generator posted by luv2wrench on May 23, 2012 at 08:21:32:
If you have the original genny, there is a 3rd brush which sets the max charging rate. Never set the 3rd brush closer to the main brush than 3.2 commutator bars. The main brushes are 180 degrees opposite from one another. The 3rd brush is in between. Move the 3rd brush in the direction of rotation to increase output. Max rate of charge is 9-11 amps hot, 13-16 amps cold with the light switch in the high charge position, no load. (in otherwords, the first notch on the switch without the lights on) The first notch grounds the field terminal on the genny to make max output. If you have poor contact between the switch and the box, the box and the steering post, or the steering post and chassis, you will not have a good ground on the field terminal and it won't charge.
The field wire, natural with a black tracer connects to the light switch at the end of the field resistor. At low charge, the field is grounded thru this resistance, at hi charge, the field is grounded directly to chassis. The resistor that looks like a wire coiled up, (no solid center piece like the field resistor) is to dim your head lights.
All this assumes that you are using a cutout relay (original) and not a voltage regulator.
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