Hi Jon,
To be honest, I don't know the answer to your question. I was taught to test a coil by switching on the ignition; removing the distributor cap; running the HT lead from the coil to earth and opening and closing the points. If there's a spark, it's OK, if not the coil is on its way out. You can obviously do this hot or cold and see what happens.
Don't know if that helps?
Best wishes,
Nick
To be honest, I don't know the answer to your question. I was taught to test a coil by switching on the ignition; removing the distributor cap; running the HT lead from the coil to earth and opening and closing the points. If there's a spark, it's OK, if not the coil is on its way out. You can obviously do this hot or cold and see what happens.
Don't know if that helps?
Best wishes,
Nick