Ive used both a sprak jump tester and a spark plug.
I ran my volt meter on the wire that goes form the coil to the distrubitor. with the key in the on position it should 12 Volts. I then tested it with the engine trying to crank over, the volts did not go up at all. I thought the coil was meant to boost the amount of volts it puts out.
also when i was testing it. i got it to spark one time, but i could't get it to do it again.