Self-Amplified sub

Hello, I tried to install my self-amplified sub and its not working. I followed these instructions given in the package: There are 4 connections necessary for proper operation of the BA-1 00. (See figure B) 1. 12 Volt (12V): Connect this wire to a source of + 12 volts which does not turn off with the ignition key. It may also be connected directly to the positive (+) terminal of the battery. 2. Ground (GND): Secure this wire using a screw or bolt on a grounded metal surface of the vehicle. Clean away any rust, dirt or paint from the surface to make sure a good connection is made. 3. Speaker Input Positive (SPK +): Splice this wire to the wire going to the p.ositive (+) terminal of the speaker that you have chosen (sometimes indicated by a red dot). 4. Speaker Input Negative (SPK -): Splice this wire to the wire going to the negative (-) terminal of the speaker that you have chosen. This completes the wiring of the BA-100. Re-check all connections to make sure they are secure. Is there anything that i could be missing since my sub doesn't work. All of the wires are connected to their designated colors. When I connect my ground wire to a metal surface of my car , the lock of my car lock themselves does this mean anything? Thank you for reading and your help will be ver appreciated.

Find a different spot to ground it...'89 Mercedes-Benz 300E

Pioneer DEH-5900UB

(2)RE Audio SX 10"s

(1)US Amps MD3D

3ft^3 @ 37Hz

Blowing up in a car accident doesnt worry me, as long as I'm putting out some major dB's when I die...

i just tried that an no luck still. but whenever i move the ground wire against a metal surface my sub makes a crackle noise in spirts.

nope, when it was moving under the electrical tape, when i was testing different spots.