farmall 100 charging

jeeper

I have it on my Super A, has been working well close to 15 years now. When I bought it the auto electric shop sold me the GM Delco and changed the internal regulator to 6 volt, same price as had he sold it 12 volt. I hooked it 3 wire and at first I just had two wires I touched together to excite the alternator. I have since used the extra wire in the wiring harness of tractor, and I now excite the alternator with a push button switch at the dash. The battery I put in new when I did the 6 volt alternator conversion lasted 13 years. First time in my life, I ever had a battery go over 10 years.

I have 12 volt with alternators on my 130 and 140, if you come here some morning and the temp is -20F, with tractors all in my unheated shop, I guarentee the Super A will be going and out the door, with the other two, maybe even ahead of them. 130 is also quick, so it will be a toss up between those two with 140 coming last.

Nothing wrong with 6 volt, as long as it's wired right and wires kept clean and tight. I once started a 6 volt Farmall 300 at -40F, completely unassisted by any means. All 1939 to 1958 4 cylinder gas Farmalls, with properly maintained 6 volt system will start at temps as low as -40F.

When you change from 6 to 12 volts you can EITHER use the old 6 volt coil but add an external series voltage dropping (12 to 6) Ballast Resisistor after the switch and before the coil OR ELSE use a true full 12 volt rated coil no ballast required.

A generator can still work at EITHER Pos or Neg ground regardless if 6 or 12 volt, you just have to polarize it correctly and the coil (per above) and ammeter leads need to be wired correct or it will read bass ackwards. Dont forget to change any lights to 12 volts.

John T