In Reply to: HELP.....8N generator gurus? posted by Mark M on August 28, 2021 at 22:44:35:
Go out and get yourself the required reading --- i.e manuals as a newbie. The armature, bearing ID, and pulley nut are all metric. The early, '39-'49 ones used the .59-20 thread and the later ones with 2-Brush & 20 amps used .669-20 thread. 15mm = .559 and 17mm = .669. 20 is the inch pitch size. The keyed shafts and pulleys were metric as well. Don't ask why. Go to Dennis Carpenter or Just8Ns for parts. Brush set is p/n 40-10069 and Bearing is p/n 9N-10094. You don't need a 35 or 60 amp generator. You have some incorrect information. Bearings and brushes are the same from '39 thru '49. When Ford changed to the 20/2-Brush generator, it now had the 17mm armature and pulley. All 8N's and Voltage Regulators had 3-Wires. Brushes and wires are not involved with each other so don't get confused. The generator and the voltage regulator have connections for ARM FLD and GRN regardless how many brushes they had. DC sella both the early and the late 8N voltage regulators. If you have the original Auto-Lite one, keep it but it as it may still work fine. I suggest you to rebuild your original generator. If you want a bit more starting power, go to a 12 volt system.