While you're at it, make sure the lens in on correctly. About half of our exterior lights had the lens upside down, I.E., the drain notch at the top allow water in that then can't get out. On some of the marker lites they even tried to seal the drain notch rather than mount the lens correctly. BTW the lens are marked which it top!!!!!! Skilled Craftsmen, I think not, or maybe they just can't read.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top