[Marshall V. Daut]

Push the third brush to maximum output, meaning as you are looking at the side of the generator that faces out, push the third brush all the way DOWN to increase the charging rate for a test. If the third brush is set too far up, the generator may motor, but it won't put out any charge. You can hear and see the difference in the speed that the armature turns over when the third brush is set at either extreme. I had a frustrating experience after going through a generator that just wouldn't charge. 'Turns out the third brush was set way up top and wasn't putting out anything, besides turning over slowly. I finally realized my mistake, moved the third brush down (in the direction of engine rotation) and viola! The generator started charging! I set the third brush halfway between the extremes and was very happy with the result.
Marshall