Piper PA-32R-301T SARATOGA S, Maintenance Manual

Page: 240 / 956

D.C. GENERATION (cont.)
(f) Stator Ground Test (Refer to Figure 31)
1 Set ohmmeter selector switch on resistance scale 1000 and zero the meter.
2 Connect one meter lead to bare metal portion of stator core and other lead alternately to
each of the stator leads. The ohmmeter should read infinity (no needle movement). Be
sure lead is making good contact with stator core surface.
3 If meter shows any reading (needle moves) the stator is grounded and must be replaced.
Stator Ground Test
Figure 31
(g) Diode Testing (Refer to Figure 32)
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 shown 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 continuity 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.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
24-30-00
Page 24-35
Reissued: July 1, 1993
1L11
STATOR
OHMMET ER