just got to correct the impedance suggestion, 2 or 4 ohm is the resistance of the coil, if there is resistance then the sub should work, no reading and the wire is broke, dead short and the sub wont work either. first off, get a voltmeter and check between the main power cable and ground terminals of the amp. Should have 12-14 volts. If its there then check between remote and ground terminals with the headunit on.