Question, if none of the dome lights are working and the over ride switch over rides the dome lights , how did you determine the over ride switch is working properly? There is more than 1 fuse to that circuit , which fuses did you check? Have you tested the circuit for continuity? No Lights working is a power interruption ,you can use a VOM , or a test light to trace the circuit to find where the open circuit is . if the lights are not working how did you test ?