I'm curious what could be worng with a trailer. I work on computers
and have been accused of not having the most common sense, so I just
see a metal thing with wheels. I have done some wiring in the past and
it went off without a hitch.


Trailers usually have exposed wires and connections and can get cut or
corroded. I suspect it is in your wiring job, but you can eliminate
50% of your search by testing it with another vehicle, preferably one
with a factory connection.

If I were adding a trailer connection, I would go to a dealership and
order a factory 'plug and play' harness and be through with it. I did
that with my Explorer for around $25 I believe.

Or take it to any U-haul center and let them do it.

As simple as adding a trailer connector should be, I have never had
much luck with doing it myself splicing wires.