6 volt to 12 volt on a farmall H

Mark Fry

New User
my tractor had a half way done job of a 12 volt conversion, I am trying to complete the job by adding an alternator 12v. The question that I have is do I need the resistor if I already have a 12v coil
 
If it is a true 12 volt coil no resister is needed but lots of them will say on them either external resister needed or no external resister needed
 

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