i actually found the problem. i am kinda a bit surprised about what the problem was because i checked it multiple times with a volt ohm meter. it was one of the jumper wires i was using. it had a gap in the wire somewhere. when i checked it with a volt meter because that is usually one of the first things i check, it was working fine. i actually figured it out when i was using it for a set of lights that i knew worked, so then i tested it again, and that was the problem. so i got a different wire and tested the sub and it worked fine. at least now i know how to work on it and got a chance to check for cracks and leaks. thanks anyways.
also i knew the motors were good. there was no corrosion, no rust, the motor didnt smell like burnt enameling, and the wired inside the motor were not burnt. bearings were fine. it was like the entire sub was brand new.