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A short doesn't have to short all the time. A frayed wire that hits ground during a bump much like you described loosing headlights during a bump could be the culprit here.

You've got a short somewhere. I wish I could help you narrow it down better than that statement but that's all I can do for you from here. Once you fix it I recommend you install a 40 amp relay near the headlights, for the headlights. Wire the power from the headlight switch to the headlights...