"I did see some wording that said, use with external resistor"
If it says that my best "guess" is it means just what it says i.e. it requires the resistor or else it will overheat....Id try that coil WITH the unshunted external ballast n see what happens.
"Since the tractor has 12 volt system should I ask for a 6 volt or 12 volt coil to install on it?"
You can EITHER use a 6 volt coil PLUS the external series voltage dropping (12 to 6) working ballast orrrrrrrrrrrr a 12 volt coil with no ballast required. However to utilize the ballast by pass system for improved cold starting you would need the 6 volt coil plus a good ballast. Id be tempted to just use a new full 12 volt coil (NO ballast required) and do away with any ballast or by pass circuit headaches...
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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