Piper Comanche PA-24 Service Manual page 772

PIPER COMANCHE SERVICE MANUAL
TABLE IX-VII. TROUBLESHOOTING
(c_)
TrouDI.
Cou ••
Generator operating
Shorted or open armature
within rated speed. coils.
range but voltale
output 10". (cont)
Improper operation of the
voltage !ellUlator.
Generator operating
WiriDl not properly
within rated speed
connected.
ranee but voltmeter
indicates zero.
Grounded or open field
cOlI assembly.
Generator operating Unstable operation of
within rated speed
the voltage reculator.
range. but voltage Same as "Generator
output is erratic. operating within rated
speed range but voltage
output low", above.
ExceSSive sparking at Same as 'IGenerator
generator brushes. operating within rated
speed range but yoltage
output low", above.
Generator operating Generator field magnetized
within rated speed in the wrODI direction.
range but system am-
meter relds off scale.
System ammeter fluctuates Generaun, system is over-
excessively .hen in- loaded.
dieating rated load.
Improper operation of gen-
erator reverse-current
relay.
Loose connections.
3 Fl
R ......
y
Replace lenerator or arm-
sture.
Adjust rellUlator.
See electrical system wiring
diagram.
Remove the generator and
replace with one known
to be in good condition.
Replace voltage rellUl.tor.
Use remedy under "Gen-
erator operating within
rated speed range but
voltage output low".
above.
Use remedy under "Generator
operating within rated
speed range but voltage
output low", above
Flash field with. jumper
wire on reBulator between
generator and battery.
Check the system for
abnormal load •.
Readjust to operate i'roperiy
Ti&hten connections.
ELECTRICAL SYSTEM
ISSUED: 8/18172