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When power goes to the coil, it stores up energy and when the current stops (points break or in your case, you turn off the car) it send the current through the secondary circuit, to the spark plugs.

Sounds like there is a fault in the triggering circuit, not cutting the current to the coil. Chick the wires to the distributor, check to see if the points are closed, it the cam rider is worn or if it is electronic, you might need a new unit.

jclay

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There is a 'start circuit' which sends full battery volts to the coil while the starter is running - but as soon as you let the key go the volts drop back to ~ 6 volts by sending the power through a resistor cable to the coil. Check all the wires are connected - and put a voltmeter on the coil and watch the readings.