pigtail off of relay: can see exposed wiring where it got hot and melted when I started the car. relay where wires had melted 2nd time around. what is it for? (friend says: heater choke relay). none of numbers show up when searched, not sure how to replace it. thought maybe there was an issue with this, that's why wires had melted right by it, and that's why I wanted to replace it.