This is for a single speaker car. Anyone have a picture of connector from dash speaker to where it connects to??
I have this orange and red wire connected to back of radio, but speaker is missing.

There is a 3 wire connector also coming from back of radio too that nothing connects to it. I assume two wires go to speaker, but what about the third?

Sounds like you have a stereo radio, which means you will need a 3 speaker dash, a crossover box and the correct harness.
Otherwise , if your car is a single dash speaker, your car originally had an AM radio and the green/black speaker wires from the radio would plug directly into the speaker itsself.
If you have green black amd purple speaker wires ,that's stereo,and you will not be able to hook that radio to a single dash speaker .
The green and purple are both pos + speakers and both channels share the black as ground .

Greg