System not workin

ok i dont have a dmm to use so that rules that out, i didnt hook up the cable to the battery until i had finished all the wiring. it sparked when i put it on which i kinda expected, the amp turns on, just dont have sound, im goin to try the rca swap, he had all this shit in his old car an is just gettin around to this now. I just feel stupid this has never happend before. Theres a first for everthing. If anyone has a DMM that is free tommrow would appreciate (cheektowaga).