My guess is NO. You use the same 6 volt starter and replace the generator with an alternator. Some people buy a one-wire alternator and others wire in a three wire Delco or Hitachi. I have used both methods and I am happy with both. You can find the proper wiring diagram in the archives here or just wait awhile and someone else will probably provide a copy of it for you.
SDE
 
Can not say yes or no. If you check the archives you should be able to find a diagram tha tBob posts from time to time as to how to wire the Delco 10si alternator. Pretty simple and one I have done to many times over the years on to many different tractors. A simple alternator made to fit a 1980 Chev pick up no power any thing no ac will cost around $45 at O'Reilly's auto part. The a radio shack diode 276-1661 and the plug that plugs into the alternator and a roll of 10 gauge wire and a roll of 14 gauge and your very close to set
 
I have designed alternator kits for a number of Farmall tractors, but I do not have one for the 100, but I would like to add that tractor to my list. My e-mail is open. You could also check out my web sites there are lots of different pictures of kits on Farmalls. charlierepair dot com Here is a picture of the Hitachi on a Farmall B.
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I still think the best way to do a 12v conversion is to change your generator to 12v. Looks original and same brackets & belt fits - a lot less cobbling. I've done several M tractors this way. Just my opinion.
 

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