I was reading a long term (40,000 mile) report on a 2017 Ford Raptor and this came up as an issue.
"The 30,000-mile mark passed during a wet, salty February. About that time, our truck's trailer-wire plug kept shorting and causing an unrelenting instrument-cluster warning as well as an audible bong every time the short occurred. And if you're wondering how Ford deals with an issue like this—according to our dealer, it afflicted many F-150s—it's to blow compressed air into the contaminated plug and wait for drier weather to arrive, which it did. In June. In the meantime, the bonging continued."
Maybe replacing the wiring or pin connector would solve the issue?
https://www.caranddriver.com/reviews/a23888636/2017-ford-f-150-raptor-reliability-maintenance/
"The 30,000-mile mark passed during a wet, salty February. About that time, our truck's trailer-wire plug kept shorting and causing an unrelenting instrument-cluster warning as well as an audible bong every time the short occurred. And if you're wondering how Ford deals with an issue like this—according to our dealer, it afflicted many F-150s—it's to blow compressed air into the contaminated plug and wait for drier weather to arrive, which it did. In June. In the meantime, the bonging continued."
Maybe replacing the wiring or pin connector would solve the issue?
https://www.caranddriver.com/reviews/a23888636/2017-ford-f-150-raptor-reliability-maintenance/