It could be something as simple as dirty contacts in the pigtail. I run into that occasionally (more often on the receptacle on the trailer), and I carry a can of contact cleaner. Spray it into both the pigtail and the receptacle and it’ll clean out the gunk and restore the blinking.
Trailer blinker passenger side not working
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Petey786, Aug 23, 2022.
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