Re: farmall H 12volt resistor for coil

Posted by John T on May 30, 2008 at 05:38:03 from (66.244.97.31):

In Reply to: farmall H 12volt resistor for coil posted by Narrowfarm on May 29, 2008 at 14:38:45:

On that 12 volt tractor you can EITHER use a full true (some call internally ballasted) coil or else a 6 volt coil with an external series voltage dropping (12 to 6) Ballast Resistor.

Take note on coil labels, a 12 volt may read "12 volts" or "12 volts NOT for use with external ballast" while a 6 volt may read "6 volts" or "12 volts requires external ballast" which is in reality only a 6 volt coil and requires the ballast just like it says.

If you alrerady have a good 6 volt coil n wanna use it the ballast (Keith has ya covered in ohms n watts values) is a cheap addition but if you dont have any coil at all prob cheaper to just buy a 12 volt coil no ballast required

John T

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