on in this thread on chevytalk, they are discussing headlights and things as well... I thought of your thread here and thought this might be something for you to check.
-W
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http://www.chevytalk.org/threads/sho...gonew/1#UNREAD
53chriscraft
See if the rubber plug that is on the radiator support is the culprit. I had only low beams. When I switched to high beams had no lights. Thought it was the dimmer switch, but it turned out to be a somewhat corroded connection inside that rubber conector. Wiggled it and abracadabra.