Alternator Checks Summary - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERVICE MANUAL
•
TAILE IX·I
SUMMARY Of ALT!RNATOR CHECKS
COMPONENT CONNECTION RUDING
RESUL TS
ROlor Ohmrneter from slip nng to shaft
Very low
Grounoec
(Fii. 9-1:-
I
110 volt
Il"SI
lamp irom slip nni to shaft
Lamp Iichts
Grounded
Ohm"'fOl£>r across slip nnR'"
Very high
Open
110 volt tesl lamp across s irp nngs
Lamp fails to light
Open
O",Ien and ammeter to slip rings. across
Observe voltmeter and
Compare with spec i-
..lip lings ammeter readings
f,catlons In 1G·186
for shorts
Stator
Ohmmeler from lead to frame
Very 10'" Grounded
IFlg.
9-19)
110
';011
test lamp from lead to frame Lamp lights Groundec
Ohmmet£>r across each parr of leads Any rnding very high
Open
110 volt lest light across each pall of leads F ails to light
Open
Diode
Ohmmeter
derOIS
diode. then reverse Both readings very low Shorted
(Fig. 9-20) conn .. r: Ions
Both readings very high Open
!
12 volt test lamp across diode, then reverse Lamp fails to lisht in both Open
connections checks
Lamp lights in both checks Shcr.ed
ELECTRICAL SYSTEe
ISSUED:
1"ln2
3816