How to Install an Amplifier to a Stock Stereo


Lift the hood of the vehicle to gain access to the battery.


Remove the rubber coverings over the positive and negative battery terminals.


Loosen the clamp on the negative battery terminal with the wrench or pliers. Pull the negative cable from the terminal and lay it away from the battery until the amp is installed.


Loose the clamp on the positive battery terminal with the wrench. Place the amplifier wiring kit's ring terminal onto the positive battery lead post. Tighten the clamp to the post, holding the ring terminal in place on the lead. Pull the fuse from the holder on the ring terminal until the installation is complete.


Connect the blue power supply cable from the amp wiring kit to the ring terminal. Route the cable through the firewall and into the vehicle's cabin. Use an established path from the engine compartment to the inside of the vehicle. The power supply cable will end up near the floor on the driver's side of the vehicle.


Remove the vehicle's stereo from the stereo mounting dock in the dashboard. Removal instructions can be found in the vehicle repair manual.


Disconnect the stereo wiring from the back of the radio and connect the wiring to a wiring harness adapter. The adapter will allow you to connect the signal cable and turn-on lead for the amplifier.


Plug the wiring harness adapter leads into the corresponding outlets on the back of the stereo. Plug the signal and turn-on lead cables (included in the amplifier kit) into the appropriate leads of the wiring harness adapter. See the wiring harness adapter manual for instructions on which leads are specifically intended for the amplifier cables.


Feed the amplifier cables from the stereo through the back of the stereo mounting dock. The cables ill emerge near the floor of the vehicle. Consult the repair manual for instructions on how to access stereo wiring from behind the dashboard.


Replace the stereo into the dashboard stereo mounting dock of the vehicle.


Run the power supply cables on the left side of the vehicle and the amplifier cables from the stereo down the right side of the vehicle to the location of the amplifier.


Plug the power cable into the power input outlet on the amp. Connect the signal and turn-on lead cables to the appropriate outlets on the amplifier.


Attach the grounding wire included in the amp wiring kit to the amplifier and to a screw or bolt near the amp. If you mount the amp beneath the seat, use a bolt that anchors the seat to the seat track. If you choose to mount the amplifier in the trunk or rear cargo area of the vehicle, use any bolt that is directly connected to the frame of the vehicle. The grounding source should be no farther than 18 inches from the amplifier for proper grounding.


Connect speaker wires to the amp and route them to the location of the speakers you designate to receive the boosted signal from the amp. Connect the wiring to the speakers. You may need to implement a speaker wiring harness depending on your vehicle's speaker. Return to the vehicle's battery.


Replace the grounding cable to the negative battery lead and tighten the cable's clamp to the post using the wrench. Place the fuse into the holder on the ring terminal and close the holder's lid. Replace the coverings over each of the battery terminals and close the vehicle's hood.

Vehicle owners who seek a more powerful car stereo can choose from several options. You can swap the factory stereo for a new model, either from the vehicle manufacturer or from an aftermarket unit, and pay to have the system installed. Another choice would be to replace the speakers with better sounding, higher capacity units. A common deficiency among factory stereos is not the speakers or the stereo, but the amplifier (or lack thereof) powering the signal of your car audio system. Add an amp to your stock stereo and take full advantage of your factory radio and speakers.