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Park Lamps not Running Lights
I fixed the problem, as with many things easy when you know how.
Bad 15 amp mini fuse in the Power Distribution Box in the engine compartment.
The things that threw me off were.
The fuse was opaque so it seemed to be intact when I looked at it, but a multi meter showed voltage on one side but not the other.
The fuse #8 seemed to be for the trailer wiring. i.e. the description of the circuit was:
Trailer tow Electronic Brake Illumination, Park Lamps, Trailer tow park lamps relay coil.
I was thinking of the circuit as being part of the vehicle wiring not the trailer, and didn't realize one would effect the other.
I was thinking of the circuit as "Running Lights" not "Park Lamps"
Reflecting on it, the switch for the running lights, side lights, park lights(how ever you think of them), does have a "P" on it, so that means PARK.
I also forgot that the warning noise that the lights were on wasn't sounding, not that that would have helped much.
I think when I put in the 7 way LED tester the other day I must have blown the fuse. Looks like I'm going to have some issues wiring up the 7 pin connector, the 4 pin seems fine.