DarbyJudy,
Your problem is very difficult to diagnose (12volts to lights ONLY while gen or shore).
Based on the info in front of me, I'm not sure I can see a way for that to happen. Without generator or shore power, turn your internal DC lights on.... Press the battery switch on your front drivers console & see that the DC lamps stay dark. Doing that energizes a relay in your electrical compartment. This will test if a relay is hung up. I suspect though, that nothing will happen & the lights will stay dark.
Next, on my Sun Voyager, there are a "bunch" of relays mounted helter-skelter about in the electrical compartment. One of those goes to your DC fuse panels (under a bed or near a kitchen counter?) It is called the "Bed Base Relay" DUH. Check ALL the relays very carefully for a tripped one. It is very difficult to tell if they are tripped. There is a little arm that sticks out when tripped. Push the arm back into the "hidden position" and see if your dark lights are lit.
For the lights to be lit sometimes says that it is not a burned fuse. I cannot find a converter bypass around the above relay.
Let us know if you happen to find a relay in the tripped position. That happened to me. I've since put a florescent dot on each relay arm to easily see if one has tripped.
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