1. Closing switch 5 (see fig. Connection diagram for testing the starter on the stand), when the voltage of the current source is 12 V, turn on the starter three times with different braking conditions. For example, with braking torques 2; 6 and 10 Nm (0.2; 0.6 and 1 kgf·m). The duration of each starter activation should be no more than 5 s, and the intervals between starts should be at least 5 s.
2. If the starter does not rotate the ring gear of the stand or its operation is accompanied by abnormal noise, then disassemble the starter and check its parts.