Diodes - Standard Generator; Ohmmeter Method; Heat Sink Diodes; End Frame Diodes - Pontiac Grand Prix Service Manual

6E-12' 1%9
PONTIAC SERVICE MANUAL
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OHMMETER
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OHMMETER
(END FRAME) (HEAT SINK)
outside toward inside of frame until bearing is flush
with outside of end frame. Support inside of frame
with hollow cylinder to prevent breakage of end frame.
Use extreme care to avoid misalignment or otherwise
placing undue stress on bearing.
4. From inside of frame, hsen seal flush against
bearing.
5. Install stator and connect leads.
DIODES
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STANDARD GENERATOR
Diodes are checked by making use of their use of their
principles of allowing electricity to pass through in
only one direction. Two methods are available:
OHMMETER METHOD
The lowest range scale on ohmmeter should be used
and it should have 1 1/2 volt cell. To determine cell
voltage, turn selector to lowest scale, then connect
ohmmeter leads to voltmeter. The voltmeter will
Fig. 6E-21 Grounding Tab in Slip Ring End Frame
indicate cell voltage.
C.S.I. Generator
HEAT SINK DIODES
rough bearings with a new bearing which will be
prepacked with proper amount and type of lubricant.
1. With stator disconnected, check a diode in heat sink
by connecting one of ohmmeter leads to heat sink, and
3. Place flat plate over bearing and Press in from
other ohmmeter lead to diode lead and note reading
(Fig. 6E-22).
2. Reverse ohmmeter leads and note reading.
3. If both readings are very low or very high (read the
same), the diode is defective. A good diode will give
one low reading and one high reading.
4. Check other two diodes in heat sink in same
manner.
END FRAME DIODES
1. To check a diode mounted in end frame, connect
one of ohmmeter leads to end frame and other
ohmmeter lead to diode lead and note reading (Fig.
6E-22).
2. Reverse ohmmeter leads and note readings.
3. If both readings are very low or very high (read the
same), the diode is defective. A good diode will give
one low reading and one high reading.
4. Check other two diodes in end frame in same
manner.
TEST LAMP METHOD
An alternate method of checking diodes is to use a test
lamp of not more than 12 volts in place of ohmmeter.
CAUTION: Do not use 110 volt test lamp to check
Fig. 6E-22 Checking Diodes
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Standard Generator
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