Turn signal, E-starter, horn and brake light no longer work

Hello first of all. I’m new here in this forum and have a question or problem with my Rex scooter: Recently, turn signals, electric starters, horn and brake light no longer work. I have no idea why, the scooter was standing in a garage at the time and when I wanted to drive it again after 2 weeks of service, nothing of the above things worked. I only got it via the kick starter. The light works perfectly. Of course, I have s chon read several other posts on the topic and already tried a few things, but did not help anything. I checked the battery: fully charged fuse was also fine. Contacts on the battery were clean Maybe someone else has another idea what the problem might be?