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Old 12-30-2014, 12:05 PM
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Third brake light

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.
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Old 12-30-2014, 01:09 PM
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sounds like your on the right track to me... heard the 2010's have had a few issues with them doing that. even read a couple where the factory forgot to screw the ground wire in place (opps)...

are you getting any Volts to the plug at all?
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Old 12-30-2014, 01:52 PM
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This probably not the same but, I unplugged the inside cargo light in my Econoline ( because I didn't want it coming on) and the center brake light went out . The center brake light wire was in the same plug as the cargo light.
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Old 12-30-2014, 02:34 PM
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I used a test light and got nothing from that outlet while pressing the brake.
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Old 12-30-2014, 03:49 PM
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You tested fuse F12 in the fuse box? It controls the third stoplight only.
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Old 12-30-2014, 05:53 PM
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I'll check that and get back to you. Thanks
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Old 12-30-2014, 06:17 PM
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Got it. #12 fuse under the hood. Weird, the manual had it listed as "brake switch, (BOO)". Thanks blacksnapon!
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