Richard, I have the Elegant lady so our coaches are going to be different, but only up to a point. Instead of looking for a fuse, look for a relay for that circuit. The electrical load of those lights is more than the average switch can handle so it is probable the switch energizes a relay.

To find it without the aid of schematics or wire number codes, pull one of the Tivoli switches and look to find the wire numbers. Then look for those numbers on a relay or circuit breaker in your electrical bay. My Tivoli circuit was modified to use heavier relays so I will do some research today to see if i can find the original circuit numbers. That might help you.