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Hi, I assume by test light, you've checked the individual leads inside the socket, correct? Did you check from the backside of the connector if it's teachable to ensure the problem isn't the socket?There's flashing on the front lights? (my truck is a different year, so ymmv) There's some schematics out there for your year. There should be a wire in the engine bay coming out from the fuse box that goes to the front left turn signal. Maybe you can check it in the engine bay where the wire comes out. I'm putting in new wires, they say to use a special anti corrosion grease. This could rule out corrosion that connector. Sent from my SM-G965U using Tapatalk
There are oodles of posts on turn signal diag. Did you read through or use search?