MG Car Repair: 79 Midget - Courtesy Light Door Switch, door switch, courtesy light

Question
I bought a door switch for that turns on the courtesy light when the door opens. I went to install it, but when I pulled out the old one, there were three wires coming into it, whereas my new switch only has a place for one wire to soldered. Any recommendations? Could it be that only one wire will work? Thanks for any advice.

Answer
Hi Todd,
There is only one connection and one wire for the light and that is purple with a white tracer. The switch grounds that wire to make the light work. The only other wires I ever seen in that area were for door speakers if it has them.
Howard