sounds like it could be the switch or i think that truck would have some sort of a relay i think its called hidden somewhere. might want to go to a library or something and take a look at a shop manual to check how to test for that sort of thing. But since the lights still work when they are all the way on i would think it would be the switch. If the switch is cheap enough you could just change it and hope it fixes the problem. if not look in the shop manual to figure out how to test it. Have a big hammer and alot of duct tape handy just in case.
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