Gilera Nordwest, Workshop Manual

Page: 100 / 136

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Rectifier check
It is a three-phase rectifier.
Check the diode’s efficiency by disconnecting the connector end (fig. 3).
Connect the positive (+) prod of the ohmmeter to the red wire and the negative
(-) one to the white wires (one at a time) (fig. 4). With efficient diodes, the
pointer should not move.
The same operation must be carried out on the black wire and the positive (+)
prod on the white wires (always one at a time). With efficient diodes, the
pointer should not move.
If during the test, the ohmmeter’s pointer moves, this means that the diode
considered is short-circuited.
To check if one of the diodes is discontinued, repeat same operation being
careful to reverse the prods of the ohmmeter and checking that the pointer
shows a resistance of 1000 ÷ 1500
Ω
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16 - 1,2