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the ignition coil is like a common transformer one side is HIGH voltage one side has low voltages built up by magnetic induction.
the high side feeds HV to sprak the plugs. it results when points open and the collapse the store energy in the low side coil forces the coil to maintain its stored energy generated from rotating magnets. The collapsing field in the ” low side” induces the high side to build up a high voltage with nowhere to go but the spark plug to reach ground.
that HV inner coil side (secondary)….. has about 4-8 KOms of electrical wire resistance using air thin wires than can breakdown for various reasons. measuring OHMS from the boot plug to the engine frame will tell you if something impeeds voltage flow to the spark plug .
IF you read OPEN/Infinity the path is OPEN and needs to be fixed by replacing the coil, wires, boot pin etc.. see manual and utubes. see T mike videos…. one of many such videos on utube to help you out.
suggest you do some reading before tackling all these steps. visit the AOMCI westen site for great articles on the stuff (see misc articles)
testing outbaord coils T mike – Yahoo Search Results
Testing an Outboard Coil with a Multimeter using an ignition coil from the Johnson H or T
Magazine Articles | Western Reserve Chapter
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