Vehicle check. To check, you must have a DC voltmeter with a scale of up to 15-30 V with an accuracy class of at least 1.0.
After 15 minutes of engine operation at medium speed with the headlights on, measure the voltage between the terminal «30» and «weight» generator. The voltage should be in the range of 13.6-14.6 V.
In the event that a systematic undercharging or overcharging of the battery is observed and the regulated voltage does not fit within the specified limits, the voltage regulator must be replaced.
Checking the removed regulator
The regulator, removed from the generator, is checked according to the scheme shown in fig. 7-10. It is better to check the regulator, which was used before 1996, as an assembly with a brush holder, since in this case breaks in the brush leads and poor contact between the leads of the voltage regulator and the brush holder can be immediately detected.
Between the brushes, turn on the lamp 1-3 W, 12 V. To the conclusions «IN», «B» (if he is) and to «mass» regulator, connect the power supply first with a voltage of 12 V, and then with a voltage of 15-16 V.
If the regulator is working, then in the first case the lamp should be on, and in the second it should go out.
If the lamp lights up in both cases, then there is a breakdown in the regulator, and if it does not light up in both cases, then either there is an open in the regulator, or there is no contact between the brushes and the outputs of the voltage regulator (at the generator release until 1996).