Do both plugs fire when laying on the head/block/metal ground?
They both should, while cranking over on the bench or in the equipment.
As Coop mentioned, the small ground wire is the magneto kill wire.
Also, some engines have a low oil pressure shutdown switch that screws in the side of the block, by the dipstick, and they will kill the magneto if low/no oil pressure occurs.
When testing make sure the kill wire is not hooked to the magneto.
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