Hi I have an H100 van with central locking system, all doors unlock when key inserted. A few weeks ago some undesirables punched out my door locks and stole contents of the van. I bought a universal wireless keylock to install of Ebay. I don't know how to wire up to the four wires on the driver side of the door. One wire is 12V positive always another wire is O V always. I think I have what is known as a reverse polarity door actuator. Has anyone wired up one of these I have been all over the internet. I am an electronics engineer so can do the work it's just knowing what to do.