Do you have power there? On our 1991 the lights are kind of persnickety, if we move the bulb they will light, most of the time. Probably need some dielectric grease or something like that. Sorry,don't know about the wires, but maybe something to check.
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1991 2691B Classic
2004 Ford F-150 FX4
Check some recent back posts that addressed this problem. On our 1990 25ft. Classic we found wires in the cupboards on both sides. You have to take the staples out of the thin bottom. You also have a bundle of wires under the cloth in the BR. Our lights went out and when we did our water/wall damage restoration we found a broken wire under the wall paneling. This panel is located above the refrigerator. There is a way to rewire without tearing into the paneling. See back post.