I'm pretty sure the fuse box for high/low beams is under the dash (driver's side). It's behind a plastic cover, above the brake pedal. Check out these sites too:
www.gm-trucks.com
www.fullsizechevy.com
www.gmfullsize.com
www.performancetrucks.net
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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