First of all I would use 8 gague wire for the power and ground. Second, why did you use a switch instead of the remote line?
1.)Try hooking up a different speaker to the amp. If it works, then it's your sub.
2.)You can also touch a 9v battery to the wires of the sub.(since it seems to be stuck in the box.) If it moves, then you know that the current is still flowing through it and chances are it's good.
Make sure you post the out come of your findings.
2006 Jeep Liberty
Adire Audio, Cadence, Clarion, MB Quart
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)