Audio Systems: car stereo or possibly speakers, pioneer speakers, cassette radio

Question
     Hi I have a problem, ok I have a 88 beretta it used to have a cd players but someone broke in and stole it...so now I have a cassette/radio with pioneer speakers.they worked fine for awhile then all of a sudden the right front and back speakers stopped working along with most the bass in the other two speakers, there's no cracklin or anything no volume out of the right two, I undid the right two speakers and hooked them up to the left side to see if they still worked, and they did still work, I don't know what could be the problem, a wire? a fuse? the speakers? the stereo itself? Thanks a bunch if you can help :P

Answer
Jon ,

  
 try running a set of wires from your right side head unit connections to a set of your speakers to test and see if its in your factory wiring .. if it works with this bridge just run new wires direct from your head unit .. if it doesnt work the head unit is the problem swap it out .. hope this helps you out if you need anything else let me know

thanks