[Gmecm] MIL wiring (Newbie Question)

[Tim Eichhorn]

This is a fairly easy question, I think.  What is the standard wiring for the MIL output  to the lamp?  I have put a voltmeter on it and it seems to go high (WRT GND) when the lamp should be off and low when the lamp should be on.  This is actually a MEFI 4 controller, but it is a Delphi/DELCO product and shares much of the same architecture and features as it's automotive cousins.  Is this output actually a switching ground i.e., should my MIL have 12V+  on one side with the other (GND) tied to this "output"?

Thanks,

Tim