I was driving at night on a B road stuck behind a tractor, I had an opportunity to overtake so I dropped a gear and floored the pedal. As I overtook the tractor both front headlight bulbs blew!! Not nice driving with just sidelights in the dark, luckily I was on a straight at the time and could stop the car.
After checking the bulbs the passenger side bulb had a black mark on the glass whereas the drivers side was also blown but didn't have this mark. The bulbs were Ring Xenonmaxx which although I assume would be more susceptible to blowing than ordinary bulbs due to their brightness, were only 2 months old. This suggests to me that it was more some kind of voltage surge hence the black mark on the passenger side. Has anyone else experienced this?
Some background info. I was having problems in the past with the lights dimming and battery warning light coming on but a change of the alternator serpentine belt seemed to fix this as the old belt was worn out. No idea if this is something to do with the problem or if there is possibly some kind of voltage regulator in the system somewhere? It could also possibly be something to do with the extreme cold weather we've been having but unlikely as both blew at the same time. Anyone any ideas?