GMC Safari headlight problem

What will cause the headlights not to work on a 1998 GMC Safari? The switch has been replaced.

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Surely someone checked the bulbs first?! s
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Bulb's could be out, there could be a short, the switch could be defective. Could be many things.
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Blown fuse. Blown bulbs. Bad relay. Damage to the wiring harness.
--

-Mike-
snipped-for-privacy@alltel.net
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The headlights are usually on a self resetting circuit breaker. If there is a short they will reset but go out almost instantly. Naturally if the circuit breaker resets enough it will probably eventually fail.

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