Burnt Connector

I pulled the Yamaha ignition switch off the bike. It was spliced into the original Honda plugs in the back of the fuse box. One of the connectors (red wire) looks like it got kinda hot. I noticed the same thing on 2 other Nighthawks in the salvage yard. Hope this isn’t a common occurance. The ign switch I bought for it came off a VF500C (magna) I believe, its the exact same switch tho, and doesn’t look near as toasty. Good thing I’ve got a full can of dielectric grease.