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If this what it is, how would I know, the ground on the trailer plug on the truck works fine. Also i have multiple trailers and have the same problem with all of them

Hi Guys, this seem to be the place with the answers. I have an 01 Yukon XL the trialer light have been working fine until last night. I have no right brake light on the trailer, but do have right turn light. and when i put on the left turn both trailer lights light up like the hazardous...