Connect the positive plug of the rechargeable battery to a conclusion "1", a positive wire of the ampermeter – to a conclusion "2", a negative wire of the ampermeter – to the negative plug of the battery.

Turn on the checked electric motor, after a seat stop in extreme situation continue to give tension. Make sure that current will fall less, than to 1 and for 4–90 with (the safety lock will work).

Disconnect wires.

Approximately in a minute give tension of the return polarity on electric motor conclusions, the electric motor has to turn on.