A higher CCA rating is fine, but not necessary.įor the ballast resistor (required to reduce 12 volts to 6 volts for the ignition coil), use a generic Chrysler style (NAPA #ICR13 ) or equivalent. A battery with a CCA rating of 500 amps or so is adequate. The 12 volt battery can be anything that will fit in the box. 5 - It’s easy to swap drive pulleys on the 10-SI. 4 - The 10-SI is reliable and maintenance-free. 3 - The 10-SI is compact - will fit in the same location as the original 6 volt generator. They are readily available and inexpensive (usually $10 - $20 at junkyards).Ģ - The 10-SI is simple to wire - the voltage regulator is contained inside the alternator. 12 volt headlamp bulbs (required if your tractor has lights)įor the alternator, use a Delco type 10-SI because: 1 - The 10-SI was the “standard” alternator on most General Motors cars and on many farm tractors from the mid 70’s thru the mid 80’s.#10, #12 and #16 stranded wire and miscellaneous crimp-on wire terminals.Misc steel scraps (angle iron, threaded rod, nuts and bolts).New parts you will need (details in paragraphs below): FARMALL “M” and “SUPER M” 12 VOLT CONVERSIONīelow are step by step instructions to convert a 6 volt Farmall M or Super M with battery (not magneto) ignition to a 12 volt alternator electrical system.
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