I've been trying to find a device that will ground out a magneto's coil (primary kill wire) in a normally closed state without using a mechanical relay because I want my circuit to be all solid state.
I began to search for normally closed solid state relays, and thought I found one that would work: Vishay LH1501AB This works fine for keeping a 120V light bulb on until I apply voltage to pins 1 and 2 (LED) of this SSR. Now I tried to do the same on an internal combustion engine, except I put the magneto's grounding wire to pin 6 and then pin 4 went to the block of the engine. No matter what, spinning over the flywheel by hand, the spark plug would still spark (I don't want it to until I apply voltage to the SSR's LED).
I believe this has something to do with the contacts of pin 4 and pin 6 aren't really closed, because there isn't a voltage applied to the SSR's FETs, whereas with my lightbulb experiment, the voltage was present.
I'd appreciate any help to get this working using a normally closed SSR and not a mechanical relay, or any other solutions you may have; I couldn't find a normally closed triac.
Overview pic of what I'm trying to do: