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It would be good to know what chassis your rig is on.
I would be checking the brake light switch. - BTPO1ExplorerI would start by getting the multimeter and checking for voltage at the brake light socket. If there is voltage the bulbs are blown. If not it could be a bad brake light switch or the switch is out of adjustment. It could also be a loose ground wire on the brake light circuit. By the way are you in Concord CA or NH?
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