1993 Cobra Registry

I pulled multi lever switch off and found plug to be a little damage from heating up. I checked grounds and fuses and will check blinker relay behind radio by replacing with new one. Anyone have this problem that I've read so much about on their cobra? But with no reverse lights is odd maybe ignition is worn? This sucks.

Obvious reply, however you know for a fact the bulbs are good? Also have you checked the reverse gear connection by the tranny to make sure its not come undone?