Farmall Cub

RockClimb wrote:John,
I thought the point side of the coil was low voltage? Or is it coming from the field collapse on the coil?

It is basically a low voltage circuit, but the combination of condenser and coil form a resonant circuit, and when the points open and the field in the coil windings collapse there is a high voltage spike there. To test it, just put your hand across the side terminal of the distributor and ground while the engine is running. A magneto and distributor will both bite at that point.