[JRTJH]

This is "theory" not "fact," so don't rely on it as "absolutely true".....

If the slide motor is working, chances are that the "mini-breaker" on the bulkhead is good. In other words, if power is getting through it for the slide motor, then that same power is likely to be getting through it for the lights. So, you'll need to keep looking beyond the "mini-breaker". My next suspect area would be the slide wiring. Under the slide, either on the front edge or the rear edge, you'll find a spring and a couple of wires the exit the trailer floor and loop around to enter the slide sidewall (under the floor). The loop is there to allow the wires to flex/extend so they can remain attached when the slide is extended and when it is retracted. The spring (in some there's a plastic folding sheath) keeps the wires from drooping down and getting caught by something under the trailer.

If there's power getting through the mini-breaker, crawl under the slide, locate those wires and see if they are intact. REMEMBER !!!!! If you have a 120VAC outlet in the slide, there's both 120VAC and 12VDC in that wire loom, so don't go pulling or poking with shore power connected, the lights you "light up" may be your own !!!!!

Inside the trailer, usually in a cabinet base or in a furniture base (in the trailer, not the slide) you'll find a flat connector that attaches the slide wiring to the main trailer wiring. Sometimes that connector will disconnect or corrode and stop making a good connection, so along with checking the underside wiring, also snoop around inside the trailer where that wire loop comes through the floor to be sure that it's connected.

If those don't work, then it'll be time to identify where power leaves the trailer "main frame" and goes to the slide. You'll need to do some sleuthing to find that wire and verify that there's power. Remember, it'll probably have AC and DC voltage on it so be careful !!!!!