This step, performed using a specialized scan tool, is necessary to maximize battery life and prevent electrical system malfunctions. Some vehicles, for example some models of BMW, VW, and Audi, may require PCM programming to input battery parameters.The positive terminal is reconnected followed by the negative terminal. Anti-corrosion compound is applied to the battery terminals. The new battery is installed and the tie down system is reinstalled.In some cases, corrosion can be extreme and the cable may need to be replaced or wiring repaired. Cable ends and wiring are carefully inspected to ensure cleanliness and no corrosion.The battery tie down system is loosened and the old battery removed. The vehicle’s negative cable is removed from the battery, followed by the positive cable.When the battery is already completely dead, this step is unnecessary. A temporary power source might be installed to avoid the possibility of losing radio presets or stored data in the PCM while the battery is out.Your battery should be all charged and you should be ready to go. Negative (black) clamp first, the positive (red). Next you will disconnect the cables in the opposite order in which you attached them. ![]() Once the battery is charged you can turn off the charger, then unplug it from the wall. Either way it is a good idea not to move the charger or play with the cord during this process. You may be able to set an amount of time for the charger to work, or it may shut off automatically when it is done. Plug in the charger and let it do its work. However, if you are quickly trying to start the2002 Mazda Protegé you will want to use a higher amperage. Trickle charging is the better method to use if you have time, as it will do a better job charging your battery. If you wish to slowly trickle charge the battery, you want it set to a lower amperage than if quickly trying to start your 2002 Mazda Protegé. Next, you need to set the volt and amps on the charger. The negative post will have a “-“ indicator on it. Next attach the negative (black) clamp to the negative post on the battery. The positive post will have a “+” indicator on it. First attach the positive (red) clamp to the positive post on the battery. You can charge the battery while it is still inside the 2002 Mazda Protegé or if it has been removed, either method is fine. ![]() Once you are familiar with the basics of your battery charger, you can now connect it to the vehicle’s battery. Step 2: Connect the Charger to the Battery ![]() Inspect the instructions and make sure you understand how the charger works and what each button, dial or reading is used for. Not all chargers are the same so you should familiarize yourself with your particular model prior to using it. Obviously before you begin, you will need to acquire a battery charger. Hopefully, you will avoid the need to charge your battery, but if you find yourself in a situation where the battery life is dying and it needs to be recharged, then here’s how you do it. Also you should remember that while the change is slim, there is always a risk that a battery may explode when you try to charge it. When charging batteries it is always a good idea to wear safety goggles. If your battery is dying, or you are having issues getting your 2002 Mazda Protegé started, you should consider carrying a portable charger in your trunk, just to be safe. ![]() Car battery trickle chargers slowly recharge your 2002 Mazda Protegé s battery and are invaluable to have. As a dead battery is a common problem, especially in the cold winter months.
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