Is there a test mode on the EM2 warning lamp? My alternator is only putting out 12.6 volts and my EM2 has the voltage flashing, as it should. But my warning light doesn't light up. Shouldn't it? It hasnt lit up yet, even with the engine not started and 0 oil pressure.

Bob Mears

Supermarine Spitfire.

It would seem that something is amiss with your warning light circuit.  If the Em2 reading is outside of your limit settings, and the value is flashing, the warning light should be lit.  On mine the warning light comes on each time I start my engine, as apparently something goes out of range on startup – probably voltage and oil pressure.  Test the light and the circuit.

I built in a test circuit with a button on the panel to test the other LED warning lights that I have. The engine warning light is not on the circuit as it gets tested on each startup.

Al