Right rear speaker won't work - Help!
 

Hi, I just bought new Pioneer to replace my rear speakers. I have cut the adaptor that fits in the original speakers and wire the good color in the new speakers. The left one is working but the left one won't work. I have tried it with and external source and it is working well. Also, I have tried to wire the dk blue and lt blue cable with the original speakers and they don't work anymore, looks like I don't have power anymore in these cables..

I have a Cobalt LS 2006 coupe, without Onstar. I have a Infinity as front speakers and an aftermarket radio with C2R Gm11b installed by a professional.

Thanks!