I did not read all the post to see that you had found the problem. There must still be a broken wire on the driver side.
Sounds like there is a bad connection/broken wire on the wire that goes to the running light.
Look to see what color wire is common to both trailer lights.....I think it is normally brown. If you have a volt meter, check to see if you are getting voltage to the light....you are probably are not getting power at the light.
Then trace the wire back to the truck and check the plug in on the truck to see if it has power. Somewhere there is a "break" that is not allowing power to get to the light. There could be a broken wire on the trailer [near the plugin connection] or on the truck. Maybe you can look under the truck bumper and find where the running light wire connects to the truck.....then wiggle that connection. The lights might come on because of a bad connection.
If you don't have a volt meter or a light tester......you can still trouble shoot using a short piece of wire. With the trailer wire un-plugged, run a ground wire [usually white wire] from the truck to the trailer. Make sure that you make a good "ground" connection to the trailer.
Then take a short piece of wire and use it to "jump" the power from the truck blinker or brake wire and use that to see if the trailer "running light" will light up. Also, use this jumper wire to test that the brake or blinker light will work.....using the jumper. This will let you know that the ground wire is making a good connection.
Working with trailer lights.......been there done that a few times.
Let us know what you find............
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