Insulated tools should be used to attach cabling to battery terminals. Batteries store a large amount of energy and if short-circuited a battery could explode and can create intense discharges that can damage your eyesight.
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Connections must be clean, free of corrosion and properly tightened. The quality of the electrical connections to the battery posts is important.Generally, charging output will be in the range of 13.8 to 14.8 volts but the exact specifications vary by make and model. The car is started and charging system output is measured and compared against the factory OEM specification to ensure that the new battery will properly recharge.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.