Visually to find not closed chain happens difficult enough as the oxidised or bad connection of contacts frequently is difficult for noticing. Sometimes simply enough to move a wire of connection or a wire in a plait of wires to eliminate this malfunction.
Unreliable work of elements of an electric equipment also is frequently caused by the oxidised or bad connection.
The malfunction finding in electric equipment system is represented enough simple operation if to understand that work of system of an electric equipment is based that the current flows from the accumulator through wires, switches, the relay, safety locks and burnt through crosspieces to electric equipment elements (a bulb, the engine etc.) and on (weight) of the car, whence it arrives back in the accumulator.
Any malfunction in electric equipment system represents a hindrance in a current of a current from the accumulator or to it.
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