[HDowse]

You can adjust the 3rd brush as folks have mentioned or you can ask Tom Wesenberg (see post above) about his electronic voltage regulator that goes inside the generator and automatically adjusts the generator output to the load. I've had one in each of my cars for a few years and they take all the worry out of boiling the battey or not getting enough charge. Pretty easy to install or send your generator to Tom for a look see and installation. No connection with Tom except as a happy customer. You ought to see what that Powerhouse puts out in my '28 Leatherback!