Sure sounds like a bad switchbox to me. No spark on one side is almost a dead give away. Make sure they are both grounded. If you 100% positive that your didn't make a mistake swapping them . . . then There is a test for the trigger and stator in the manual using a multimeter . . . You won't have to pull the flywheel to test them . . . just disconnect them from the switchboxes and check for continuity . . . specs are in the manual. If you need me to scan some pages . . . . I can do it. I have TONS of 9/16amp merc parts, so don't go buying anything new. I have 30+ switchboxes and several stators and triggers for that engine.
How's the wiring (harness to coils, trigger wires, stator wires)?
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