I am putting together a 1986 Alfa that I purchased largely in parts and pieces. I am working on the three-pronged power switch in the trunk area. the wires are color coded. Presumably the middle (black) more is ground and can be grounded to the trunk lid to ground the license plate light assembly. Presumably one of the contact switches runs to each of the 3 lights in the light attembly -correct? Why are there 3 connects? What is the third one for??? Thanks for the help in advance. Between pictures and what I have found on the site I have the car in running condition and am not putting the electrical system back in order. Man these Italians don't make these systems easy to figure out sometimes!!!