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Plug socket issue. When attempting travel trailer hook up plug at socket will not engage all the functions. Tail lights work but unable to operate trailer lift to set tow ball on hitch. Lights inside trailer won't work. Changed battery, not the problem. Replaced the tow socket, not the problem. Fuses, not the problem. Is there a wiring issue elsewhere?
How long has your 2005 Hummer H2 had this problem?
Just bought a travel trailer. Works on mom's Sequoia everything functions.