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Trailer Running Lights Out
My 05 F-350 6.0 4x4 trailer running light circuit is dead. No trailer running lights. Truck running lights work fine. No power to the back the inner trailer plug connector. No blown fuses under dash or fuse block under hood. I jumped power to brown/white trailer running light wire under the under hood fuse block, trailer running lights come on. Problem is somewhere upstream of there.
Last time I towed, no problems. This time, no trailer running lights. No problems with trailer, or any other electrical issues.
I hate to chop the harness and put in a relay with new power feed, but don't seem to have any options. My Power Stroke mechanic buddy said he has had the main fuse block not send power to the trailer fuse block, suggested replacing the main fuse block.
Anyone have a similare problem?