Well, scratch that... The voltage on the constant power from the battery is staying constant, but the M2 isn't switching properly. Something else I just found out now because I tried for the first time is that if I have it set to ACC and then crank the car, it restarts, as well. Unfortunately, I don't have room for the Opus board where I have my computer mounted. I'll try looking into other options, though. If need be, I can probably just wire something up with a power relay and a PIC processor to do the startup/shutdown and just use the M2 as a dumb DC-DC PSU.