The health of the winding and the reliability of the fit of the brushes to the slip rings can be checked on the stand without disassembling the generator by measuring the resistance between the plug «67» and generator weight.
If the winding does not have short-circuited turns and the brushes are well ground to the slip rings, then the resistance should be 4.2–4.7 ohms at a temperature of 20°C.
After disassembling the generator, check the resistance of the field winding between the two slip rings, which should be (4,3±0,2) Ohm at 20°C. In this case, it is necessary to monitor the reliability of contact between the rotor rings and the conductors attached to them.