One of methods of search of a point of short circuit is 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 electric equipment of this chain are switched off.
In a chain there should not be tension. Move wires here and there and watch a control bulb. If it lights up, so somewhere in this area short-circuits one of wires, it is probable in that place where isolation was wiped. The same test can be carried out on any other element of a chain, including the switch.
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