Why Should I add a Second Battery?

Adding a second battery will allow you to use your accessories when the vehicle is turned off, without having to worry about starting your engine back up. When you add a second battery, you wire your accessories to your auxiliary battery. This way, when the vehicle is off, they pull from the voltage of the second battery instead of the battery that is used to charge the car. When the car is on, the isolator switches over and allows your vehcile s charging system to charge both batteries. This is perfect if you are ever stuck and need to winch out, if you need to use lights for a repair, or if you just want to play your vehicle s stereo system while in camp.