Warning lights
in 912iS Technical Questions
8 years ago
I read the wiring diagram again and it dawned on me that the MS25041 "press to Test" warning lights I was going to use for the Lane A & B warning lights may not work according to plan. The MMS25041 light is supposed to be across 12 volts and ground, and when you test it you ground it. then would that be EMS ground or airframe ground?
However the wiring harness diagram shows the warning light between two wires from the ECU and I get the feeling neither of them are grounds and that I could fry the electronics if I fed in 12V to test the lamp.
Is this a reasonable assumption and thus not a good idea? I also wanted a press to test lamp for the aux fuel pump but wouldn't that need to be grounded to the EMS ground? This one is important to me to have because the fuel pressure regulator doesn't like two pumps working at once and failure to switch off the auxilliary after takeoff is not a good idea.
However the wiring harness diagram shows the warning light between two wires from the ECU and I get the feeling neither of them are grounds and that I could fry the electronics if I fed in 12V to test the lamp.
Is this a reasonable assumption and thus not a good idea? I also wanted a press to test lamp for the aux fuel pump but wouldn't that need to be grounded to the EMS ground? This one is important to me to have because the fuel pressure regulator doesn't like two pumps working at once and failure to switch off the auxilliary after takeoff is not a good idea.
