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If you connected a battery to the trailer lights only( truck disconnected I presume) and experienced the same thing it sounds like the ground on the trailer has a bad connection, the symptoms you are describing I have had several times and has always turned out to be a bad ground. You should locate where the ground wire in the wiring harness connects to the trailers frame, remove it and make sure there is shiny metal there, take a wire brush on a drill, sandpaper, grinder, something to get to bare metal, then reconnect it back and test again with the batter, that should eliminate that problem.
If you are saying the truck now has the same problem with the trailer disconnected not sure where to tell you to start on that one.
Good Luck
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2002 Quadcab, all stock, less one muffler and resonator.
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