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You need to connect the Power wire (Most likely red wire with fuse) to the battery and run it to where you put the amp. You need to also drill a whole in the car and make sure it is grinded up and bare metal is shown. Screw the ground wire there with a bolt and nut. You will then need to run the rca cables from the amp location to either the back of the headunit if it has RCA outputs, or use a Line out converter, you can get them at best buy. Then you need to find your cars wiring harness code and figure out which is the remote ignition turn on and tap into that and feed that wire back to the amp to turn it on. Hook all wires up and make sure power and ground DO NOT TOUCH.
Is your sub in a box? the power light is on your amp? try to connect a car speaker to the port you have the sub plugged into, if the speaker works its not your speaker terminal on your amp it's the sub. Check the wiring on the connectors of the back of the sub itself and the wire terminals inside the box (if sub in bass box)
Please let me know if this was any help and let me know if it solves your problem
Make sure you have both power wires hooked up. There's the main power lead/cable going to to the battery, and the trigger wire from the accessory wire from the radio (antenna) to the amplifier.
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The problem is the amplifier is drawing more amperage than the alternator can provide. Install a capacitor in the battery feed line to the amplifier (can be purchased at any car stereo store). Do not go with the cheapest as this is a storage battery and like a battery cheap ones fail quickly.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage drops below ~11 volts on either terminal when you drive the amp hard, you need to check the wiring feeding whichever line is dropping too low.
on rockford amps, the bass control knob needs to be connected to get the maximum output (+18 db gain i believe). If you did this to the power wires, then yes, you may have at least damaged the bass control knob. Try replacing this to see if you get all of your gain back. If not, then you have damaged something inside the amp...maybe a capacitor or power supply inside. If that's the case, you'll need to get the amp looked at by an electronics repair technician or local stereo shop.