All trailer connectors lost left turn and brake light. I followed the wiring to under the fuse box in the front of the truck. What is feeding that wire? the right side and marker lights work fine. I noticed that there seems to be two different systems truck and trailer package. The truck everything works fine it is just the left side of the factory trailer wiring.
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Obtain a wiring diagram and follow the diagram using a multi-meter to isolate the problem area. Most likely a short or break in the wire. Possible corrosion.
See “Wiring Diagrams” tab to your left.