When the crankshaft rotates, the starter should consume a current of 250 A, and the voltage on the battery should drop to 9.6 V. A malfunction of the electrical connections is checked by a voltage drop on the wires at the time of crankshaft rotation. Voltage drop between (-) battery and cylinder block should not exceed 0.2 V, and between (+) - battery pole and starter terminal should be close to 0.