I do not have the auto dim mirror on my 2015 WRX. On my 2013 Outback i used the mirror pigtail to power my radar detector. I just pulled the front light assembly down found the pre-wired mirror pigtail and when I test all three prongs they all came back as ground. This was whether the car was on or off. What am I missing? One should be hot when the car is on, yet none were?
Any help would be appreciated