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Test lamp: Connect the leads of a test lamp, consisting of standard
fl ashlight batteries and a fl ashlight and built, as shown in Figure 24,
across the rectifi er in one direction. Then reverse the leads. The light
should light in one direction but not the other. If the light lights in both
directions, the rectifi er is shorted. If the light does not light in either
direction, the rectifi er is open.
Replace defective rectifi ers with rectifi ers of the same operating
characteristics as rectifi ers installed in the generator at the factory. Order
rectifi ers by part number, including the model and type of exciter as well
as the generator serial number.
Surge protectors may be included on the rotating rectifi er assembly.
Disconnect one lead of the surge protector, and connect the leads of an
ohmeter or makeshift test lamp, consisting of standard fl ashlight batteries
and a fl ashlight and built as shown in Figure 24, across the surge
protector in either direction.. If the light comes on, the surge protector
is defective. Order surge protectors by part number, including the model
and type of exciter as well as the generator serial number. Following
replacement, make sure that the revolving fi eld, exciter armature, and
rotating diode leads are properly secured.
Figure 24 Test lamp
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