What would cause the connectors on my fan switch to start to melt. It appears that they have been hot enough to cause the connector to disform, but no fuse has blown and the switch still works. I have noticed that the previous owner had changed the wire that connects to the ac relay had placed a ground wire on one of the screws holding the relay to the ac box. I have replaced the harness and most likely will replace the relay, unless I can figure out how to check the relay. But I still wonder why the switch got hot enough to heat up the connector. Any Ideas out there.