Sub/RCA Problems

Hey guys, Im glad to be a new member of the forums,but down to my problem. I have a 1994 Toyota pickup, and i have installed 2 Kicker CVR's with a 880.2 Soundstream Xstream amp. They worked great until yesterday, i was making my wires cleaner to my amp and after i did i hooked it back up JUST LIKE I HAD IT. And to my suprise only one sub was hitting. I have changed around the RCA cables several times but it seems as if the left channel RCA cable does nothing, but i know both channels and both inputs on my amp work cause i didnt do anything wrong to mess them up and i have tested them. Any information, or ways to fix it by you guys would be very much appreciated. I was thinkin maybe it was the wires from inside the box cause like today i was ridin to school, and it started to hit, but then it would quit and then hit again like off and on. now its just not hittin. Thanks guys in advanced

damn you guys answer fast :) and thanks man for the info will do, ill keep you guys updated on what i find

did you blow a voice coil onthe suspect sub????  use your dmm and check the vioce coil for the proper resistance.

I found out what it was, i checked the unworking sub and it seems that one of the wires running from one of the voice coils that goes to the motor come off so i saudered it back on and it works great