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No, I still think you have some kind of bad ground... I'm afraid with out the truck to do some basic tests I just think I'll lead you down a path.... that might consume hours...
Maybe sand off a bear spot on the trailer frame, and run a set of jumper cables from the - side of the battery to that spot you just sanded off... see if a really good ground solves the problem..
With happening with 2 trailers to the same truck makes me believe that your right and the problem is in the truck... and I'm still thinking ground.. but can only assume its a connection at the frame somewhere...
Also pull the female connector from the truck, check those connections and while its loose from the truck plug the trailer into it.. than consider trying your jumper from the ground at the back of the plug to ground...
Good luck..
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Jim
08 5500 -110K miles, 04 3500 4x4 Dually Blue stick, 300K miles, 05 3500 4x4 Dually Molten Red stick, 96K miles, PacBrake Exhaust Brakes, 05 Jeep Grand Cherokee Limited, 05 Honda Rincon 650 ATV, 2001 Honda Goldwing
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