2003 chevy 1500HD lighting issue

hi, i have a friend with a 2003 chevy 1500HD quadra-steer LT. the two rear brake lights are not working. the brake light on the cab is functional, and i also get 12v on the trailer brake plug, just nothing on the bed mounted brake lights (bulbs are good, just no power at the sockets). i replaced the

4 plug wiring block mounted on the rear cross-member and it made no difference. i have power going through all my fuses also. before searching for an odd issue somewhere, im hoping someone can suggest any common or known issues. thanks,
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Nathan W. Collier
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