Checking additional diodes on generator 37.3701 (VAZ-21051)

A short circuit of additional diodes can be checked without removing and disassembling the generator. Just as for checking the diodes of the rectifier unit, it is necessary to disconnect the wires from the battery and generator and wire 5 from the "B" terminal of the voltage regulator (see subsection 12.13).

connect the battery "plus" through a lamp (1-3 W, 12 V) to terminal "61" of the generator, and the "minus" to one of the rectifier unit mounting bolts.

If the lamp lights up, then one of the additional diodes has a short circuit. The damaged diode can only be found by removing the rectifier block and checking each diode separately.

A break in the additional diodes can be detected with an oscilloscope by the distortion of the voltage curve on the "61" plug, as well as by the low voltage (below 14 V) on the "61" plug at the average rotation frequency of the generator rotor.

(The article is copied from the website www.vazbook.ru)