Farmall H 12 volt coil

ycanby · Feb 16, 2015

Hello, my son has a 1949 H that has been converted to 12 volt. It appears to use a 12 volt Ford car coil. It still uses a resistor block ahead of the coil. Is this necessary when the coil is already 12 volt?.
Thanks, YVC

Bob · Feb 16, 2015

That would depend upon the resistance of that particular coil's primary windings.

In ball-park figures, if primary resistance is 1.5 to 2 Ohms, it NEEDS the resistor. If primary resistance in in the 3 to 4 Ohms range, a resistance likely ISN'T needed.

Janicholson · Feb 16, 2015

Most 12v ford coils (before 75) were for use with resistor. Jim

Farmall H 12 volt coil

ycanby

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Bob

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Janicholson

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