- 1). Open the hood. Disconnect your car's negative battery cable by loosening the terminal connection with a wrench. Open the trunk.
- 2). Find a spot to mount the second battery. In most cars, the area next to the amplifiers in the trunk is the best location. In SUV-type vehicles, just inside the rear tailgate may be a better place for a second battery, and some trucks have plenty of room right behind the driver's seat. Wherever your amplifiers are mounted, mount the auxiliary battery as close as you can. Putting the new battery close to the stereo components will make the wiring easier.
- 3). Mount the battery. This installation will focus on a car installation. Place the battery box where you want it in the trunk. With a drill bit loaded into the drill-motor, drill through the box's mounting tabs and through the trunk floor. Using the hardware kit that came with the battery box, place a bolt through each of the mounting tab holes on the box and into the holes you drilled. Tighten with a wrench.
- 4). Wire the positive side of the battery. Using heavy wire (at least 2-gauge), run a length of wire from the positive side of the new battery to the (+) positive-input lug of the closest amplifier. Use a wire stripper to remove the cables protective coating to allow a terminal end to be secured onto each end of the cable with a crimping pliers. Attach one end of this wire to the positive (+) post of the battery and the other end to the amplifier's power lug. Tighten each connection with a wrench.
- 5). Ground the system. Connect the ground (-) cable from the new battery to the floor of the trunk. With a screwdriver bit mounted in a drill motor, place a large self-tapping screw through the cable eye and screw it tightly to the trunk floor. Place the cable onto the ground post of the new battery and tighten the cable clamp with a wrench. Close the trunk. Reconnect the vehicle's original battery ground cable and tighten it with a wrench. Close the hood.
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