the fact that he has a wire from the starting circuit would tell me that he has a external voltage control system.
The second wire the run engine source would come from a source with a resister/regulator of some kind.
I never have seen a 12 volt coil expected to produce a clean spark at around 8 volts when starting the engine and then running at 14 volts on the primary circuit when started. You also cannot have proper voltage to the plugs at start while keeping the running voltage in specs with 33 percent change of supply voltage.
You will see that the starting voltage to the plugs will have a voltage 33 percent lower than running. As everyone here understands that is very undesirable.
Is your coil a ptc type? Do you have a amp meter? If you do put 12 volts across the coil terminals. Check the amp flow and see if drops off after a minute or so. This would be expected. if it does not drop you had better put a resistor on the run wire.
the versatile that we have has a ballast resistor on the running supply wire. If you leave the starting circuit wire off it will not start.
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