Piper Cherokee Six Service Manual 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