Hei /6 won't shut off?
I assume your coil is similar to this? I assume the terminals are common at each end. Polarity matters, correct spark discharge is negative at high tension terminal. If terminals are not marked, an inexpensive D'Arsonval type meter for 12V gauge, with a few meg Ohms in series will provide deflection to measure polarity on the high tension side during spark discharge.
I assume your coil is similar to this? I assume the terminals are common at each end. Polarity matters, correct spark discharge is negative at high tension terminal. If terminals are not marked, an inexpensive D'Arsonval type meter for 12V gauge, with a few meg Ohms in series will provide deflection to measure polarity on the high tension side during spark discharge.
