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Could be a problem with the res. coil on the back of the headlight switch.
 

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Somwtimes you can clean them with some of that plastic safe electronics cleaner.....I got some at a radio supply shop, for cleaning the rheostats and whatnot on old radio's we used to restore. Not a always a cure - but it helps. (gotta have it out totally) Otherwise make sure you don't have any crusty connections/grounds.....
 
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