In the old tractor world there are basically 2 types of coils.
One is for use in 6 volt systems and has about 1.5 ohms resistance across the + and - primary winding. This coil may also be labeled "12 volt external resistor required" and needs a resistor between switch and coil input with resistance approximately equal to the 1.5 ohms of the coil when used in a 12 volt system.
The second type is a direct 12 volt coil (no resistor required) and has approximately 3 ohms primary resistance.
"so what u are saying is that the newer after market coils already break down the voltage to 6 for the dist" Has nothing to do with "newer after market coils". The distributor, points, and condenser do not care if system is 6 or 12 volts. The concern is limiting the current through the coil to about 4 amps max.
The difference in the two coils is the type of wire and/or number of turns used to wind the primary. There is no separate resistor in the coil case. It is the same difference as a 120 volt or 240 volt transformer used in household air conditioning or appliances. A transformer can be designed to work on 120 or 240 and give the same output voltage.
A tractor coil is a transformer with one side of primary and one side of secondary tied together.
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