not one you'll likely run across. Working on things like this should be punishment for polititians caught with their hand in the cookie jar. The front of the trailer had a negative ground and the rear had a positive ground. You heard me. I was ready to rewire again because I could swear the wires were screwed up.
This was a flatbed trailer I enclosed. As a flatbed, it was made to pivot in the center, bringing the back of the trailer to ground level so I didn't have to lift ramps to load the car (bad back). It has a floor jack welded into the frame up front that you use to tilt the trailer. I still use that function. Now, why did I have the problems I did? I'm going to let you figure it out. Hint: similar to what I thought the problem was in my second post.
Time for a little
...
Dan