Thanks Gert. I don't have an aux fuse box, but may consider that in the future. The light kit came with a pre-made wiring harness that comes with a relay, switch for the handlebars and a wire which runs from the switch which needs to be tapped into a keyed source. I never heard about the horn feed, which should be easier to locate than the brake light feed maybe. I'm going to tackle the job today so will see how it goes...🤞🙏😂