What makes the headlight swich connnectors melt?

This is on a 1998 dodge ram 2500. The headlights keep flickering and other things like that and now i cam on here and read that the swich connectors melt so i was wondering what would cause this and how to fix it?What makes the headlight swich connnectors melt?They melt because they're loose or corroded.What makes the headlight swich connnectors melt?must have a short to get this hot.What makes the headlight swich connnectors melt?A bad connection or high resistance is where all of the heat will be developed - that's where the voltage drop is greatest instead of at the load where it should be.