Just because it seems to be at DC ground doesn't mean it's at AC ground. The magneto is a transformer and the physics of a transformer are such that when energized (the magnet on the flywheel passing by the secondary) each turn will have a voltage proportional to the applied voltage and the turns ratio. If any ONE turn violates this rule, the transformer does what It has to/can to bring this single turn voltage back to where it belongs, even if it means sucking up all the energy in the other windings and core and all that.
When you ground the kill switch, you are shorting out at least one turn and probably numerous and as a result, there is no energy left in the mag to fire the plug....the engine quits.
So for a problem, if nothing is obvious then you may have worn the varnish off a turn or two inside the mag. and you have a couple of wires touching amounting to the same thing as stated above. Otherwise you may have a corroded or bad connection between a wire and connector.
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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