I currently have a factory clarion am/fm w/ seperate tape in my '82 rx. I have a question about wiring up a new radio. There is a plug for the 2 speakers, a plug for the power antena, antena, and a white cirular plug . What is wire is what on that cirular plug?

 

i believe it is part of the power/ ground wiring. my advice if your going to install a new deck is just redo the whole wiring its not that hard just some wires