Starter switch problem

I got the lights and everything to work but it still wouldn't start, so j took apart the switch and found this, anyway to fix this or will I need to replace it? The red wire that goes into the switch is disconnected 

You can re-solder it if you have a soldering pen and a steady hand.  Best bet is to pull the switch out to get more clearance from the yellow wire as you don’t want to damage it either.

Later, Doug

Also don’t keep the heat on for too long or you’ll loosen the contact in the housing