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My center high mount brake light isn't working. I drive a 2010 F350 CCSB. The lights on either side (cargo lights) work but not the brake light in between them. All wiring for the lights comes in from one wiring harness. I have replaced the bulb, it didn't work. I tested the fuse, its good. I tested for power at the socket, no power. I'm thinking bad ground. What do you think? Everything else is working perfectly.