You say..."I assume if I put this one on it will burn up the electrical system?......
WRONG WEEDHOPPER
The correct answer is it will NOT burn up the electrical system BUT THE SPARK WILL BE VERY WEAK. Since the new coil is what some call "internally ballasted" (no external ballast required) and is designed for the full 12 volts, you no longer use the old external ballast (it dropped 12 down to 6 for the old 6 volt coil) thats there now. You can remove it if you like or simply wire past it by feeding the new 12 volt coil direct (no ballast required) from the IGN switch.
Heres the deal:
It sounds like you now have a 12 volt tractor that used a 6 volt coil PLUS and external series voltage dropping (12 to 6) Ballast Resistor. So if the new coil is designed for the full 12 volts (says no ballast required) just like it says YOU DO NOT USE ANY EXTERNAL BALLAST.
On a 12 volt tractor you can EITHER use a full 12 volt coil (says no ballast required) OR ELSE use a 6 volt coil PLUS an external series voltage dropping (12 to 6) ballast resistor.
A coil thats labeled "requires external ballast" is in reality a 6 volt coil, so if on a 12 volt tractor you need that external voltage dropping ballast resistor, otherwise the coil overheats and the points burn up quickly
NOTE On many 12 volt tractors they used a 6 volt coil (labeled requires ballast) plus an external ballast on purpose BUTTTTTTTTT the tractors were equipped with a ballast by pass DURING CRANKING ONLY for a hotter starting spark and improved cold weather starting. So if you have to start at exterme cold temps and iffffffff the tractor has a ballast by pass while cranking option,,,,THEN YOU MAY WANNA RE CONSIDER AND GO WITH THE ORIGINAL 6 VOLT COIL PLUS BALLAST SYSTEM. That would mean you buy a 6 volt (ballast required) coil and use the ballast as is so it drops 12 down to 6 for running but when starting the ballast is by passed for a hotter starting spark.
SUMMARY you must either use a 12 volt coil (no ballast required) and toss the ballast orrrrrrrrrrrrrrrrrrr use a 6 volt (ballast required) coil and still use the ballast.
Your tractor your choice, we report YOU DECIDE
Hope this helps, if I missed anything hopefully the other fine gents can add to this
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