I have a 2005 Mini coopwe S, I installed the Scangauge 2 into the obd 2 port and my voltage while the car is running AT IDLE is at around 12.2 with the a/c on. If I turn all the loads off than I get to about 13.3-13.5 volts. If I turn on ALL the loads than it will get as low as 10.3 volts. When...