One of methods of search of a point of short circuit consists in getting a safety lock and to connect a control bulb or the voltmeter to plugs of connection of a safety lock when all other elements of an electric equipment of this chain are switched off.
In a chain there should not be a pressure. Move wires here and there and observe of a control bulb. If it lights up, means, somewhere in this area short-circuits one of wires, it is probable in that place where isolation was wiped. The same test can be spent on any other element of a chain, including the switch.
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