Remove, clean the battery connections, both positive and negative, both on the battery and to the ground and to the starter.
Have the electrical system checked at any autoparts store (battery, starter, alternator, drain test), this is a free service.
If this problem started immediatley after the headlight switch was replaced, then it was installed wrong or the wrong switch was used.
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Wednesday, November 19th, 2008 AT 8:43 AM