Quote:
Originally Posted by BigApe
No other faults. No blown fuses, nothing. Just the headlights blowing.
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If it was a really serious voltage problem, then you'd expect other bulbs and/or fuses to blow, but it's possibly just a weird combination of the higher power headlight being just sensitive enough to react to the increased current caused by a small over-voltage.
Fuses are surprisingly tolerant to small overloads. The high beam may be robust enough to cope (being even higher wattage filaments) and the lower power tail light etc may have sufficiently higher resistance to survive for longer.
Sounds tenuous I know. As suggested previously by others, you really need a meter on the terminals to check the voltage.