can you explain how you connected it to the truck? are you using the factory 7-pin connector with a 4 pin adapter? how did you test the trailer lights? did you connect it to another vehicle wired for trailer lights, or what?
one possiblity I see is ground and running light wires reversed, with no good gound to the trailer.
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There is a relay that needs to be put in under the hood near the fuses.
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Forgot about that, I assumed since he had something working that he already put the relay in.