So i have a BMW 328i that is having an electrical issue, It seems whenever the throttle is pressed the lights on the dash light up and power to the A/C, Radio, and cooling fan get disconnected. The interior headliner lights turn on by themselves and the windows do not roll up / down.
Video:
https://www.youtube.com/watch?v=R4JIA973FiQ&feature=youtu.be
From what you describe my first guess is that the voltage regulator is bad. Another possible issue could be the age of the battery itself or loose ground contact.
What I would recommend is to get a scanner that read fault codes from all the modules and do a full system scan. Here is a guide on how to do that.
The other option is to take the car to a mechanic and let them troubleshoot it.
