R2 Cat generator ground system

Forum,
I want to reinstall a 6 volt generator on my R2 Cat. Tried it before and finally figured out how to make the generator charge at a higher rate. It will not have a voltage regulator, just a diode unit as a cut out. Question is does an R2 have negative or positive ground? This particular R2 has a 6 volt electric starter, not pony starter. If negative ground I will simply run a line to the positive post on the battery. Any and all thoughts welcome.
One more thought it has an Eiseman mag which is independent from the charging system.
 
All Cats up till the twenty four volt system were positive ground, a generator will charge either way positive or negative ground depending on the way the generator is polarized, usually say when you would fit a new or repaired generator you would have to polarize it, fit it on the engine connect it, connect the the battery and momentarily hit the ARM terminal with a hot wire its now polarized whatever way the battery is connected, I don't know about where you would put a diode in a DC system but you will have to match the polarity to battery/generator.
AJ
 
(quoted from post at 00:38:47 07/16/22) All Cats up till the twenty four volt system were positive ground, a generator will charge either way positive or negative ground depending on the way the generator is polarized, usually say when you would fit a new or repaired generator you would have to polarize it, fit it on the engine connect it, connect the the battery and momentarily hit the ARM terminal with a hot wire its now polarized whatever way the battery is connected, I don't know about where you would put a diode in a DC system but you will have to match the polarity to battery/generator.
AJ

Thanks for the info! I will follow your advice. I have polarized many a generator in the past 60 years and will have to take care when utilizing the diode. As mentioned I finally figured out how to make the generator charge at a higher rate. The last time in northern Minnesota I noticed one of the brushes was/is adjustable. I know the generator is good because it motors when tested. Will know by the end of next week if it works out.
 
Usually the adjustable voltage is a three brush generator, my memory of the adjustment was the light switch when no battery was used, if a battery was used there was a cut out instead of a regulator, a two brush usually had a regulator, you must be wanting to keep it authentic, most people now would lose the generator and use a one wire 12 volt alternator, you would have better starting and better lights, change the coil to 12v and keep the 6v starter it will last just as long with the 12v or even longer as the engine will not need to be cranked as much.
AJ
 
Thanks again for the advice. I am not really keeping the R2 authentic, just want a better starting system utilizing the original generator. Several years ago I attempted to replace the 6
volt generator with a 12 volt generator with regulator and 12 volt battery. Major problem was getting enough rpm out of an engine that at full throttle only develops 12-1500 rpm. Along
with that the belt is a C width belt which does not work well with a narrow pulley. So, back to the original 6 volt system and utilizing the system that worked before. As far as an
alternator, there in no room for such an application. The original generator is mounted directly to the block with belt tightening system where the fan pulley screws in and out to adjust
the tension. For an old '41 Cat it runs and is fully operational with minor issues. Runs a lot better than my '65 HD3 diesel Allis. Hope to get that bled in a day or two after a 3 year non
running stint.
 

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