[wingnut60]

Welcome to the forum.
Not familiar with your unit, but following the wiring harness into the trailer body should
get you to the batteries. Normally, the harness goes up into the pin box under the front of the trailer where there should be a junction box. Inside will be some connections, and following the red/black or white lines out should go to the batteries. There also should be a door access on the outside, or maybe under the furniture inside.