To test the starter under full voltage, connect the leads «30» (big withdrawal) And «50» (small wire next to large terminal) wire with a cross-sectional area of at least 4.0 mm2. If after that the starter will work properly, you should check the power circuit of the starter (thick wire). If the starter still does not work, you need to remove it and check it.
A qualitative check of the starter is possible in a service station using special equipment.