I have just replaced my multifunction switch problem may be getting worse.

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. My first thought is that your fog lights may not be "factory installed". In that case, it would make sense that you would have such issues. I'd recommend having someone disconnect tapped in wiring to the lighting for the fog lamps, which are probably not properly installed in the first place. This will resolve your signal issues, and allow you too maintain the proper fuse where it is required. "A tad melted" as far as a connector - this is a major concern. You can probably obtain a connector if you try; if you're capable of doing that work - yes, do some looking and you can find a connector. Or reach out to a shop near you. Lighting wire connectors can melt due to the large amount of power going through, but especially if wiring is tapped in that doesn't belong. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.