car speaker wiring
 

I am trying to wire the original AM radio back into my '67 Camaro. The back of the unit has 3 ports: speaker. ground and power. I can't for the life of me remember how to wire a car radio. Do both sides of the speaker wire go to the speaker port? Or, does one side go to the ground port? Or, does the ground port ground to chassis and one side of each speaker wire also ground to chassis?

help!
thanks