Hello, I’m new on this page, I’ve only recently been a car and hope I’m right here. Although I’m a car mechatronics engineer, I have a lot to do with electrics. However, I’m still young and trainee. My question is: I have an Audi 80 bj. 1980 66/90 kw/ps. I bought a radio, subwoofers, amplifiers and the matching cables. Now I installed everything and “everything” really connected. Well the radio works. I got the car from my father and he has a Ra but the radio only works when the light is switched on?? That’s the case now, I would like to change that. But that’s not the main topic and that’s the remote doesn’t seem to work?? The new radio has a cable with a note on it Remote dadran I connected it. Or do I have to connect the remote cable anywhere else but from radio to amplifier? The battery was empty after installation and had to disconnect the cable again. it’s all the rest NEW and now I come to the actual problem.If I want to plug the fuse into the amplifier, there is a spark and the fuse is through again.In short: backup flies through as soon as I want to plug it into the amplifier. Remote does not work. Radio only works with light. If I have forgotten something, I can write it afterwards. I can also make pictures. Thanks in advance for help.