Check of integrity of a chain is necessary to define, whether is not present in a gap chain. Disconnect tension from a chain and check a chain on integrity by means of a bulb with the connected power supply.
Connect bulb wires by the chain ends (or to the positive end and (mass) of the car). If the control bulb lights up, in a chain there are no gaps. If the bulb does not light up, means, somewhere in a chain there is a gap.
Precisely it is also possible to check the switch, having connected a control bulb to switch plugs. After turning on of the switch, the control bulb should light up.
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