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Thank you very much, I have been looking threw the manual for days trying to find how to solve this, I just went out and tried your solution which is a button above my aux switches.
I am still learning about this truck,
Every time I connect my camping trailer to my 3500 the back up warning beep thinks Im about to hit the trailer and is so loud I cant here anything else.
On line it says to go to the commercial settings and shut it off, but the only items in my commercial settings are auxillary switch settings...