Without disassembling the generator, use a multimeter to measure the resistance between the generator terminals to first determine if the generator is defective. The method is as follows: use the RxI level multimeter to test the resistance value between the generator "F" (magnetic field) and "one" (ground), as well as the generator "+" (armature) and "one" (mass). ) The forward and reverse resistance values between them comply with current regulations under normal circumstances
If the resistance between "F" and "-" exceeds the specified value, it means that the brush is in contact with the collector. defective ring; if it is less than the specified value, it indicates that the excitation winding has an inter-turn short circuit; when the resistance is 0, it indicates that there is a short circuit between the two slip rings or the "F". "The terminal is grounded.Place the test rod"-" of the multimeter against the generator housing, and the "+" test rod against the "+" terminal of the generator. If the multimeter points between 40 and 50f, that means. the diode is normal. If the multimeter shows a value around the ion, it means that individual diodes have failed and been shorted. If the resistance value indicated by the multimeter is close to 0 or equal to 0, it means that the diode installed on the end cover and the diode installed on the component board have failed and short-circuited tubes.
However, if the diode is open internally, it cannot be detected externally with a multimeter, and the generator must be disassembled and inspected one by one.