Those metal things on the tongue that you are tapping on are the circuit breakers for the main battery feed to trailer, the tongue jack and whatever else. Tapping on them means you really need to check your ground connections and the circuit breaker connections on the tongue. Right after those breakers should be a box that the 7 pin cable connects to. That is supposed to be sealed, but it's probably corroded.
Basically, if you need to do these things, you need to do some service on your 12 volt system by the tongue.
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2015 Sierra 1500 Denali
2014 Coleman 249RB
David Jon Devoucoux
People, Places & Things...for over 40 Years!
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