Dave, Thanks for the update and youre sure welcome, glad we could help..... I thought I explained the whole 6 volt and 12 volt coil thing for you in my other two long posts pretty well, but its hard to put in a paragraph what would take a long article to cover correctly, perhaps this will help. I give 90 minute Seminars on Coil Ignition at several National John Deere shows so it obviously cant be covered here in detail in 5 minutes lol....
1) MANY (not all, read my earlier post) what some people call "internally ballasted coils" dont actually have any internal discrete resistors laying inside them, they have more wire length/coils or higher resitance wire in the primary so the total resistance is like 2.5 to 3.5 ohms for a 12 volt unti and 1.25 to under 2 for a 6 volt unit.....
2) A 6 volt coil has around 1.5 ohms primary resistance while a 12 volt has more like say 3 ohms NOW I BET YOU WONDER WHY LOL
THE REASON IS SO THE POINTS DONT HAVE TO SWITCH MUCH MORE THEN 4 AMPS OTHERWISE THEY WOULD BURN UP TOO FAST
ITS THE SWITCHING CURRENT OF MECHANICAL CONTACT POINTS THATS THE LIMITING FACTOR ADN WHY THERES AROUND 1.5 OHMS PRIMARY RESISTANCE IN THE 6 VOLT SYSTEM BUT TWICE THAT IN THE 12 VOLT
Its the same reason if you use a 6 volt coil on a 12 volt tractor you need the external current reducing voltage dropping ballast SO THERES A TOTAL OF AROUND 3 OHMS (1.5 for coil + 1.5 for ballast) in the primary circuit SO THE POINTS ONLY HAVE TO SWITCH 4 AMPS get it????????
Points arent different for 6 or 12 volt tractors, they are a current switching device (how many amps is whats critical) whose voltage withstand rating is wayyyyyyyyyyyyy higher then 6 or 12 volts anyway.
SOOOOOOOO if you read my two long previous posts plus this one it may (hopefully) help you figure out those coils and the difference in a 6 and 12 volt and the reasons why and why some require an external ballast while others dont.
ONCE MORE if the NAPA coils were 12 volt (which I suspect) they wouldnt work well on your tractor BECAUSE you still had that external ballast (which you shouldnt use with a 12 volt coil) and there was low current flowing through them butttttttttttt if you had tossed the ballast they likely woukld have worked fine becasue you then would have had 12 volts on a 12 volt coil. SIMILAR if you use other 12 volt coils laying around, DONT USE THAT BALLAST. If you use a 6 volt coil USE IT get it??????
Best Wishes n God Bless, if you like e mail me and maybe I can find one of the Ignition articles I had published in Green Magazine and send to you, theres not enough time here to explain what can take years of study to understand so hang in there n keep us posted
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