Re: 09 trailer lights
I have wired several trailers & hitches and most of the time when mine would not work correctly it was because I didn't have good grounds. Make sure the grounds are on Metal and free of paint and grease.
2009 Acadia SLT-1 built 07/31/08, DLT, FWD, Summit White, titanium, 7 seater, leather, heated; purchased 06/09 no HUD, no HID, no factory Nav, no S.Roof. 18" wheels, Bose system. Pennsoil Platinum & PF63. Trans flash, water pump, seat rails & steering gear replaced, PS flush & refill with DEX VI.