Piper COMANCHE PA-24-180 Service Manual page 562

COMPONENT
Rotor
(Fig 9-17)
PIPER COMANCHE SERVICE MANUAL
0
TABLE IX-I
SUMMARY OF ALTERNATOR CHECKS
CONNECTION READING
Ohmmeter from slip ring to shaft Ven low
110 volt rest lamp trom slip ring to shaft Lamp lights
Ohmmeter across slip rings Very hgh
110 volt test lamp across hlip rings Lamp falls to light
Battery and ammeter to sip rings. across Observe voltmeter and
slip rings ammeter readings
Stator
Ohmmeter from lead to frame
(Fig 9-19)
110 volt test lamp from lead to frame
Ohmmeter across each pair of leads
110 volt test light across each pair of leads
Diode
Ohmmeter across diode, then reverse
(Fig 9-20) connections
12 volt test lamp across diode, then reverse
connections
Very low
Lamp lights
Any reading very high
Falls to light
Both readings very low
Both readings very high
Lamp fails to light in both
checks
Lamp lights in both checks
RESULTS
Groundec
Grounded
Open
Open
Compare with speci-
fications in IG-186
for shorts
Grounded
Groundea
Open
Open
Shorted
Open
Open
Shot:ed
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3B16