Hello friends of driving pleasure I have a problem and that is that I knocked off an alarm system and wanted to install them yesterday, that went in theory also quite well until I came to the place with the door contact. I inserted the copy of the installation instruction as picture. What I do not know if I should attach the to the original door contact with it or must for it a own ? We built the same plant at the friend in Golf 3 and since then the ZV does not want to be right. udi 80 Cabrio by the way has a NEGATIV switched ZV or Had I found on the Internet but you never know if it’s right I hope you can help me with this Greetings PS: