After I had my alternator replaced by a car shop, my battery light (on the dashboard) and my brake
light, also my open-door lights were and still are flickering while I am driving. They don't stay on for
a long time, maybe one second would be the most. I measured voltage of the battery 12.9 at idle, and
14.2 with the engine running. So it seems like battery and alternator are okay. Any ideas of why the
lights are flickering this way? Thanks in advance for any advices.