Well, I went out to the trailer and stuck my head up under the counter and had a look. A dealer worked on the furnace once, and there are wire nuts he installed when the furnace was removed. He had to cut/disconnect wiring to get it out.
Some of the wire nuts were loose. I'm going to replace them with a good crimped on solution. After tinkering around I thought I'd give it a try.
I'll have to wait until it's cooler. It's hard to get the thermostat to kick in when it's 95 deg in the trailer.