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 15" Brahma running off Cadence A7hc, Clarion hu, MB Quart 6.5s and 5.25s running off old school Punch 800a4
146+db @ 38hz with 1200w and a single 15"
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)