???

At first --no spark at plug .

I measured the voltage at the terminal on the coil --6 V .

Turned the engine over with meter on coil -- no change, still 6V .

Took the coil out -left the wire on ,measured the voltage at the little spring --6V .

Touched the spring to ground --nice spark at HV lead .

Then I bent the little spring a small ,calibrated amount -maybe a 1/8 inch -- put it bacxk in ---Hit the starter button and away it went --started right up .

The problem was -- the spring was not making contact with the point connection in the distributor .

I rechecked the voltage at the connection on the coil -- it fluctuated as the engine was cranked over .

By the way --- it is not just A coil --- but a transformer with a low voltage primary winding of relatively few turns ofheavy wire ,over which is the secondary winding of a large number of very fine wire .

1.) With the points Open "NO" current flows in the Ignition Circuit. Ammeter indicates 0 (zero)

2.) With the Points Closed , (side mount) >4.0 amps flows through the Coil. Ammmeter indicates ~4 amps (discharge)

If when you crank the engine and the ammeter flickers between 0 and -4 amps you can be sure that High Voltage is been developed and going somewhere(kinda like squeezing the trigger of a 357 Mag, you don't see the bullet but!!) If the Primary (low voltage) is OK look at the ouput of the coil, wire, rotor, dist cap

Hope this Helps

Good Luck