No Running Lights On Trailer

No Running Lights On Trailer. All my lights on the the truck work fine. I plugged in the trailer and turned on my head lights, no running lights on the trailer.

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The running light circuit is controlled electrically through a BCM (body control module) or a LCM (lighting control module). Now have fully functional brake and directional lights, but running lights on both sides are dead. I would check the running lights for one with a short.

I plugged in the trailer and turned on my head lights, no running lights on the trailer.

All other lights work on the truck.

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Brake and signal lights work fine. I worked until dark and no running lights on the trailer. I would check the running lights for one with a short.