I gott ask. Why change the switch if you have voltage on both sides?
Follow the hot wiring back to the rear stopping along anywhere you can find access and poke it with the light tester.
Did you find the fuse that provides the power? You also need to find the ground connection for this circuit.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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