Not sure of the exact switch you have, but look for 12 volt RV switches. My 03 3300 has a bunch of SPST snap in switches for the lights that look like these:
https://www.amazon.com/dp/B08F816MB4...ing=UTF8&psc=1
Pop them out and make sure the contacts are clean - these circuits often corrode at the wire ends - including at the switches, at the fuse panel, and at the connections at the light fixtures.
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