Electric cord connection to tow car

I'm happy to report that I did as Dutch suggested with a flat screwdriver, specifically with the pin that controls the left light. When I connected the car yesterday, all lights worked! Yay! Of course, I should have checked the lights again before I disconnected the car at home, but forgot to. Who knows what happens on the road with all the bouncing going on.

The electric contacts, both male and female all look very clean...no corrosion. I had already used Dioxit and Dielectric grease on them awhile ago, with no results.

Thanks again everyone for all the input!