I was "hypothesizing" on this one too. Not having an ELA in hand makes it a guess but I was thinking ...
I don't think it's a switch problem. I believe the switch is NOT isolated from the ELA housing when pressed, just the opposite. But the positive side IS isolated, so when you press the button, the (-) batt terminal is connected (shorted) to the housing providing a path to your (-) coil post. The other isolated post is the (+) terminal and always connected to the (+) batt end. All the button does is complete the circuit to the (-) side of the coil through the housing, and your coil connects you to the (+) end of the batt. A dirty switch would fail "open" when pressed and your ELA just wouldn't work. I think you might have an intermittent short in your Spheroid, from positive batt side to case. I would take apart the spheroid and inspect closely, under 5x mag if possible - you may see some indications of arcing.
Note: A positive side short (or arc) could only occur when pressing the button, unpressed - a positive side short would still be isolated from the (-) side of the batt.
I don't think it's a switch problem. I believe the switch is NOT isolated from the ELA housing when pressed, just the opposite. But the positive side IS isolated, so when you press the button, the (-) batt terminal is connected (shorted) to the housing providing a path to your (-) coil post. The other isolated post is the (+) terminal and always connected to the (+) batt end. All the button does is complete the circuit to the (-) side of the coil through the housing, and your coil connects you to the (+) end of the batt. A dirty switch would fail "open" when pressed and your ELA just wouldn't work. I think you might have an intermittent short in your Spheroid, from positive batt side to case. I would take apart the spheroid and inspect closely, under 5x mag if possible - you may see some indications of arcing.
Note: A positive side short (or arc) could only occur when pressing the button, unpressed - a positive side short would still be isolated from the (-) side of the batt.
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