I just dont know if that 12 volt truck (like many old farm tractors) uses a series voltage dropping (12 to 6) ballast resistor and a 6 volt coil or not?????????
If so?????? With the ignition on truck not running and ignition points closed, Id expect 12 volts to the ballast input but only 6 to 7 on the ballast output which wires to the coils input (NOT to distributor) terminal. With the points closed, theres of course zero volts on the coils to distributor terminal.
With the truck running if the charging system works the input voltage would rise to over 13.
A typical tractor ballast resistor is in the range of 1.5 to 2 ohms but Im unsure on that truck.
If the ballast is by passed or shorted out that would put like 12 volts on a 6 volt coil and it will overheast plus the poinst burn up quickly
Take a look at my Ignition Troubleshooting provedure for coil ignition on old tractors as it may still help on that truck
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