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Visually to find not closed chain happens rather difficult as the oxidized or bad connection of contacts is often difficult for noticing. It is sometimes rather simple to move a wire of connection or a wire in a plait of wires to eliminate this malfunction.
Unreliable work of elements of electric equipment also is often caused by the oxidized or bad connection.
Finding of malfunction in system of electric equipment is represented rather simple operation if to understand that work of system of electric equipment is based that the current flows from the accumulator through wires, switches, the relay, safety locks and burned-through crossing points to electric equipment elements (a bulb, the engine etc.) and on (mass) of the car, from where it arrives back in the accumulator.
Any malfunction in system of electric equipment represents a hindrance in a current current from the accumulator or to it.
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