A car’s battery like a normal battery has two poles: positive and negative. The positive pole is generally larger in diameter than the negative pole. Modern cars include negative earth technology in their electrical system. However, some older cars were built with positive earth electrical system in which the positive terminal of the battery is attached to the chassis whilst the negative terminal remains for the live. Some of the faults which might occur in the battery thereby, affecting the negative earth are shorting of cell due to failure of the separator between the two plates, shorting of cell or cells because of the buildup of shed plate material under the plates of the cell, low level of electrolyte, vibrations and corrosion could lead to breaking of plates and even breakage in internal connections, there could be cracked or broken cases, broken terminals and frequent and continuous overcharge of battery. Further, there could be Sulfation after its prolonged disuse in a low or zero charged state.