If you will notice in post #2, of the pic I took of this light that the switch is on the on position.....but the light is not on.
When I took the pic for you, I flipped the switch on, but no light. I just thought the bulb had blown and I would replace it later. I guess I left the switch on.
Today when I came home from work, the light is shining bright.
I haven't done nary a thing to the trailer, as it is parked in front of my house, and I park in front of it.
I turned the light off, and then back on...and it worked as it should. I kept doing this, and wiggling it all the best I could to see if it would quit working again...but it stayed working as it should.
So I guess my advice is to leave it on for 4 days and see if it starts working. It did for me.