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Welcome, I'm Chris (aka Moose).
Does the brake light on the cab work and if not can you confirm that bulb is good?
Do you own a test light or volt meter so we can diagnose this and do you know how to access the multifunction switch so we can test wires there?
Sorry you no longer want me to help.
Sorry you were already charged which I have nothing at all to do with. If you change your mind and decide you do want my help, and can give me a few minutes to write out answers or finish up helping others then I can help.
Best of Luck.