All My Trailer Lights Work Except Running Lights

All My Trailer Lights Work Except Running Lights. Everything works great, brake lights, turn signals, hazards. I have never liked the idea, personally I have always ran a separate wire from the truck to the trailer, connecting it through the trailer wire plug.

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There is a fuse junction block under the hood [should be in the left corner somewhere] and in that you should find the fuses for the trailer lights and other functions. Everything works great, brake lights, turn signals, hazards. Ever since I bought the D, the running lights for the trailer haven't worked, but all the lights on the D work.

Mine all looked good, but maybe one is open but not obvious.

Everything worked except the running lights.

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Trailer lights (running lights) not working all others ...

Towed my trailer earlier this week and everything seemed normal, I forgot to check the. The running lights wire (brown) has no power but everything else works, so it's not a ground. All lights are working except the left turn signal.