Piper Cherokee Six - Page 603

Zero output
indicated
on
ammeter
regardless
of
RPM (refer
to
alter-
nator system
test
procedure)
(cont)
Output
indicated
on
ammeter
does
not
meet minimum
values
specified
in alternator
svstem
test
procedure.
PIPER
CHEROKEE
SIX
SERVICE
MANUAL
TABLE
X-III.
ELECTRICAL
SYSTEM
TROUBLESHOOTING
(cont.)
Isolation
Procedure
and Remedy
Trouble
Probable
Cause
Open
field
winding
in
alternator.
(cont)
Faulty
voltage
regulator.
If resistance
is high
check
brushes
for
spring
tension
and
ex-
cessive
wear and
re-
place
if
necessary.
If
brushes
are okay
and
field reads
open,
re-
place
alternator.
Start
engine,
turn on
load
(Ref.
alternator
test
procedure),
set
throttle
at
2300
RPM.
Check
voltage
at
buss
bar
(convenient
check
point,
remove
cigar
lighter
and
check
from
center contact
(+)
to
ground
(-).
Voltage
should
be 13.5
volts
minimum.
If
voltage
is
below
this value
replace
regulator.
High
resistance
connec-
tions in
field or
output
circuit.
Check visually
for
loose
binding
posts
at
the
various
junction
points
in system,
alternator
battery
post,
lugs
on
ammeter,
connections
at
voltage
regulator,
circuit
breaker,
etc.,
(See
Figure
10-1)
Examine
crimped
ter-
minal
ends
for
signs
of
ELECTRICAL SYSTEM
Issued: 8/17/72
3D3