It blinks like it has a burnt out bulb, which it does not. The left rear blinker does not come on but the front blinker does. I have replaced the left rear light bulb strip and I even tested the right blinkers working strip and it still did not work. The fuses have been checked with none burned out. When it is connected to the 5th wheel, the 5th wheels left blinker works fine but the trucks blinker still does not.
You obviously have a bad connection somewhere in the taillight. Some trucks it is a common problem and the taillight circuit board is the problem.
Testimonial: "I replaced the circuit board I just called it a strip."
You need to get a test light and see where you do, and do not have power at the rear of the truck. It could be an issue where the trailer plug meets the main harness, since you say the trailer turn and brake lights work but the truck does not.
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