prewired home

[taslite]

Centex home prewired for 5.1. I was able to find rear left and can't find rear right. Using tracetone worked great on left wire. Any ideas?

 

[Haoleb]

If your home was wired with any sense of design it will probably have been in the same spot relative to the other side of the room. If nothing else just venture up into the attic.