8N generator replacement

I recently purchased a used generator for my '48 8N (front mount distributor).

The replacement generator has an adjusting screw on the back marked "low" and "high". It seems that the screw moves the brushes in some manner. My old generator did not have this adjusting screw.

My question is, what does this screw do, and is this generator compatable with the electrical system on my tractor.

Thanks for any advice,

-Steve

For what it's worth, this one does indeed have a 3 wire hook-up.

Thanks for all of your help,

-Steve

You have what is called a 3rd-brush generator for 2N/9N which is how the charge rate is determined by manually adjusting the 3rd-brush. And it has ONLY 1-wire output to roundcan cut-out relay mounted on steering column.

The frontmount 8N generator has 3-wires connected to it and has a square voltage regulator mounted on baside of the dashpanel. ..... .Dell

Part number 8n 10000. They should physically and electrically interchange with the later 8n 10000B although the FO 4 specs them at fewer amps.

Your mileage may vary