ORIGINAL: Charley
ORIGINAL: dditch
Could not see a spark. Turned the lights down some too.
The black coil box has 2 wires that go to the engine case.
One directly to it, the other goes to it through the ignition switch.
Both test good continuity to the case.
Those wires kill the ignition if they are connected to the case. You kill the ignition by grounding it. Open the switch and test for a spark.
CR
On the Q-75, the lug on the mag coil nearest the iron core is grounded ... usually to one of the mag retaining bolts. The other lug, and a larger one located farther from the core is the kill connection and like Charley wrote, kills the engine when grounded.
Also, Q-75 mags like to have minimal clearances between the mag core pieces and the flywheel. I usually set mine between .006" and .010". Thats just the thickness of heavy bond paper or a thin business card. These will only make a spark when turned quite rapidly .... slow prop flipping won't produce a spark.