Over the past few days, I've noticed a small problem with my 89 525i. Often while its running, I'll lose power to my computer/wipers/radio/door locks/windows/interior lights.

My OBC/turn signals/trunk lights/AC still work, but to open the door, I have to use door handle method. I think the problem MIGHT only occur when I have the air running, but I've yet to totally test this theory out. Any ideas whats up?