With the installation of a new Curt wiring harness I doubt there are any issues with the converter, and it should have more than enough power unless you have an unusual number of lights on your trailer.
I would check out the ground connection, which is likely the issue. I'm guessing you used the same ground connection when you installed the new wiring harness. Make sure it is secure on a clean, bare-metal surface. It might be best to go ahead and relocate the ground just to be sure.
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