I have a 2005 Mini Cooper 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 I rev it up with all the loads placed than it will go up to about 12.4-12.6. I don't see any warning lights or any noticeable dimming of the lights on the car. I also put a multi-meter on the battery itself and noticed the same issue.
I have replaced the cooling fan because the low side did not work and the high side was making a weird noise.
But most importantly, I replaced the Alternator with a new Denso unit to replace the Denso unit I had in it.
I also replaced the original belt to avoid belt slip and i pulled the 100amp fuse to the power steering pump to see if thats where the drop is.
No dice.
What's going on?
