8N -8 volt

And yes a 8volt battery will charge with a 6 volt system.

I have a 8 volt in my Farmall 300 and it recharges to about 8.2 volts with a 6 volt alternator. Most generators and alt. put out more than 6 volts just as a 12 puts out 14.5 or more.

That extra 2 volts on the battery spins the tractor better in cold weather.And you don"t need to switch the lights cause 8 volts will not blow a 6 volt bulb.

A 6 volt generator with a regulator won't properly charge the 8 volt battery either.

Basically it needs (and my 8N needed that nearly 30 years ago) the starter cleaned up with new brushes, a turned commutator, and new bearings (just sleeve bushings in the 8N). It needs FAT battery cable and ground strap with clean connections. Nothing from Walmart's battery kiosk is appropriate for a 6 volt system. Then it needs a good 6 volt battery and probably similar attention to the generator. On the 8N that I had, most of the wiring was shorted out from the insulation having rotted off and the wiring running through that conduit over the engine.

It will start and run fine on 6 volts, but it takes care and good wiring to get there. Battery post and all starter circuit connections need to be clean. These days, I'm applying a bit of silicone dielectric ignition grease to such connections out in the weather to keep that weather out and its making them last a lot longer between cleaning tasks.

Gerald J.