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I have a crew cab 2005 Chevrolet Silverado 1500 5.3L V8 4wd and I’m needing info on my third tail light I have a brand new one installed and it still will not come on I’ve even replaced the fuse that controls it
 

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Check the relay and brake switch. The CHMSL uses a relay and seperate circuit in switch for backup.
 

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2000 Silverado Z71 4x4 5.3L 460k+ miles w/ GM rebuilt motor and trans
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To be 100% clear, the new unit behaves EXACTLY as the original unit? Everything is dead in both the original unit and the new unit?
 

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I suspect a bad ground.

A quick test, if you have jumper cables, find a good ground (bumper), clip onto the ground, turn on the cargo lamp and touch the other jumper cable clip to the screw.
If the light comes on, the ground is dirty, or missing.
 
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