On a 12 volt tractor YES you can EITHER use a full true 12 volt coil (NO Ballast required) or else a 6 volt coil with a voltage reducing (12 to 6) external series Ballast Resistor. A full true 12 volt coil dont require any ballast on a 12 volt system and has a priamry resistance in the neighborhood of 2.5 to 3.5 or so ohms. Theres nothing else required in the ignition priamry system wiring if its a 12 volt coil on a 12 volt system.
Yous sure the voltage reducing ballast resistor was wired correct in series with the coil after the switch and ahead of the coil??? If it were a good ballast (ohms around 1.5 to 2) and was wired correct it should have reduced the current and voltage on a 6 volt coil so it will work and not burn up???
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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