Hello I wanted to upgrade a light hoop on my 50’s Piaggio Fly. So I got the light switch of the 125’s version and thought just exchange it and is good. Unfortunately, it’s not like that. Dimming and driving light work, but the light hoop doesn’t work. Do I need another relay and another cable? The plug that goes to the light switch has only 3 cables, but the light switch has 4 contacts. Thanks already for any tips.