Piper Navajo PA-31 Service Manual page 711

COMPONENT
Rotor
Stator
(Disconnected
from diodes)
'Diode
Disconnected
from stator)
Ohmmeter
110-volt te
PIPER NAVAJO SERVICE MANUAL
SUMMARY OF ALTERNATOR CHE
CONNECTION
from slip ring to shaft
st lamp from slip ring to shaft
Ohmmeter across slip rings
110-volt test lamp across slip ring
Battery and ammeter to slip rings.
across slip rings
CKS (DELCO-REMY)
READING
Very low
Lamp lights
Very high
Lamp fails to light
Observe voltmeter and
ammeter readings
Very low
Lamp lights
Any reading very high
Fails to light
Both readings very low
Both readings very high
Lamp fails to light in
both checks
Lamp lights in both
checks
Ohmmeter from lead to frame
110-volt test lamp from lead to frame
Ohmmeter across each pair of leads
110-volt test light across each pair of leads
Ohmmeter across diode, then reverse
connections
24-volt test lamp across diode, then
reverse connections
RESULTS
Grounded
Grounded
Open
Open
Compare with
specifications in
IG-186 for shorts
Grounded
Grounded
Open
Open
Shorted
Open
Open
Shorted
0
Revised: 1/29/82
Effectivity
DELCO
ELECTRICAL SYSTEM
4B9