I am trying to get the headlights working on this 74 AMF lawn tractor. I put in new lamps already. One wire comes from the lights to a pull switch mounted on the dash (see pic). There is a black wire coming off the lights as well which right now is not connected to anything (see pic), is this wire for power or ground? There is also a wire coming from the starter which goes to the dash switch (see pic). So, the pull switch has one wire going to the lights, and another going to the starter, and there is a black wire coming off the lights that is disconnected. Any thoughts appreciated, I'm a newbie at this. I can't figure out why one of the wires is going to the starter.