It sounds like you might be missing a ground to the lights.
On my MH, there was an issue with no step lights, no outside porch light, and no outside grab handle. I found that the grab handle broke the circuit routing of the electricity. Just reseating the mount for the grab handle was all it took to get all of my lights back.
Do all of the other lights work? I.E., the grab handle, porch light work but the step lights are the only ones effected?
It could also be the switch, if none of them are operational.
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