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Q: brake lights don't work, overhead cab light does. I have replaced bubs/fuse on 2007 Chevrolet Silverado 1500

I don't know where the electrical ground is. what else is there to check?
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Check to see if high mounted brake lamp works. That lamp is works directly from stop light switch and does not go through turn signal switch. Not likely a ground problem.
Yes the high mounted brake lamp does work. Do the rear brake lights go thru the turn signal switch?

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Yes...but check the bulbs on both sides first..could be blown fillements on 2 bulbs. I would then test at the sockets with a test light while someone steps on brake. Double check fuses. and check to see if a trailer wire harness could have been installed and having corosion issues there.
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