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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Without sounding too patronising, maybe you should just check the headlight bulb(s) first - the may just have coincidentally failed at the same time.
Second culprit would be a fuse - if one bulb went it may have taken the fuse with it which stopped the other from getting power.
Finally check the relay as that too may either be duff or on it's way out.