So here's a tip.
Check and clean the connections on the plugs BEFORE dismantling the lights!
The plug at the bumper.
The addaptor, if you have one.
And the plug from the trailer.
A small wire brush for the exposed metal, and I used a small round file for the insides.
You can shape a piece of sandpaper around a nail if you don't have a small round file.
I cleaned those up and now I'm lit.
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