2004 Chevy 1500
From the bulb sockets follow the wires back (usually underneath) to a plugin, should be one on each side. Pull them apart and look for corrosion in the plugins. Clean with some electrical cleaner and put back together. If they still do not work start by checking for power with a test light at the plugins to see if power is there. if so it may be that you need new bulb sockets.
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