Welcome! Where is your battery on the tongue or under one of the front benches inside?
If it's on the tongue, the wiring should be coming from under the floor somewhere. Crawl underneath the trailer and look about a foot or so back under the floor. There should be an area where the wires come out from. Hopefully you find them tied up under there, but they could be cut off. It should be pretty close to where your seven way trailer plug for the lights wires into.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR