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 for integrity by means of a bulb with the connected power supply.
Connect bulb wires to the ends of a chain (or by 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, so somewhere in a chain there is a gap.
In the same way it is possible to check the switch, having connected a control bulb to switch plugs. After turning on of the switch, the control bulb has to light up.
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