Make sure that the ground at that light is good. Most lights bolt to the trailer and use the frame as a ground, rust occurs under the mounting causing a bad ground. If you have a separate ground wire going to each light (not likely) check that.
thought I'd reply to myself one more time in case anyone out there is having similar trouble with their trailer.
I just got back from Uhaul. Hooked my truck up to 2 different trailers and sure enough, once I hooked to them the driver's side blinker did not work on either of the two trailers.
So now I know my problem is with my truck wiring.
Next step for me is to buy a T-connector and give that a try....will keep you posted.
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