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We would recommend to measure the power voltage when :
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ignition switch is ON and:
- engine OFF (also called: accessory positionVacc);
- ignition switch is ON and engine IDLE (Vidle).
A running engine implies higher power voltages than an engine switched off.
In the configuration then
- use the ignition source from power voltage and;
- in the set low voltage (mV) setup a bit more less than the voltage with running enginehalfway between Vacc and Vidle.
Then you will always see that Ignition value get ignition value = 1 only then when the engine is running.
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