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I have two trailers both running lights and blinkers won't work when hooked up to my 2000 ford f350. So I know truck is issue, all fuses looked good but I replaced anyway. I also replaced the trailer connector so the input is brand new and I still have the same issue. If I put on hazards everything works and brake lights work.
I checked wiring all the way to fuse box and I did not see any torn wire.
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