Piper SARATOGA PA-32-301 Maintenance Manual page 204

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
DIODE TESTING.
Stator must be disconnected from rectifier assembly to perform this test. Rectifier shown removed for
clarity.
1. Set the ohmmeter selector on resistance scale 10 and zero the meter.
2. Test the negative diodes by connecting one ohmmeter lead to "GRD" post terminal on rectifier and
connect other lead to each stator lead connection of rectifier momentarily. Reverse ohmmeter leads and check
in opposite direction. Meter must show continuity in one direction and infinity (no needle movement) in other
direction.
3. Test the positive diodes by connecting one ohmmeter lead to the "BAT" terminal on rectifier and
other lead to each stator lead connection of rectifier momentarily. Reverse ohmmeter leads and check in the
opposite direction. Meter must show continuity in one direction and infinity (no needle movement) in other
direction.
4. If continiuty is observed in both directions, the diode(s) is shorted.
5. If no continuity is observed in both directions, the diode(s) is open.
6. Replace the rectifier assembly if open or shorted diodes are found.
C199
0
0
DIODE PLATES
Figure 24-32. Diode Testing
EFFECTIVITY: FORD
24-32-20
Page 24-39
Added: August 23, 1982
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