Piper Comanche PA-24 Service Manual page 693

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PIPER COMANCHE SERVICE MANUAL.
9-58. R.,.I ... ,. (D.I ... R • ...,)
9-59. o..ckin, R .. ulotor Circuit. Altemator failures may
be
caused by circuit misconnections,
.lICh .. reversed l . . d. or Iborted
0'
I'oaadial of te ... iaals witb a ."",...mve,. etc. The (ollowinC
pfovid •••
meanl of
loeatitle ci.rcuit
miscOCUleeticaL
It .110
covers
the different
typeS
of
repletor
panel board circuit trace defects which iAdicate • certain type of _iring hame.1
milCODftecuonl.
A bumed circuit :race on the regulator panel board is proof that a circuit milconnKtion
.~l.ts,
or
oecuned at some time. However. a miaconaectioa will aot al_ays callS • • bumed. Circuit trac.
even thoulh circuit component
failure.
hive been cauaed..
Before installiDl a n.ew regulator, it
is
very import8IJt to make aure that no wirinC circuit
defects or wirial bamess milconnectiOft.l exilt. U the .iria. ham ...
is
defective, or if milcon-
nections eKist. tbe ne .. regulato, ... ill fail too. Futh .... ore. repeated replae.ment of ,",wators
will aaly result in repeated regulator failwes. ed this will continue until the circuit defect is
corrected.
To check the wiring harnesl for defects or miscon.nection. before iDStallin, the new regu-
lato,. observe the followinl procedure.
MOTE
Meter connections are
lIlade
to
the
ham •• s connector that has been
unplulled from the reaulato,.
a.
Check
the IItemator field resisteee with
lID.
ohmmeter a. shown in Step 1. Figure 9-24 and
note the ,eadin,. Make ..... the mute, .... iteb is OFF. R .. diaKs of lell tbOll 2 obm •• 0' IDo,e
than 8 ohms indicate a defec:tive field windina in the altemator or a defective winn& harness. If
the read.ing is Within the 2 to 8 ohm range. check the readina against the aUo.able resisumce in
the Circuit which can be calculated by dividina the specified voltage for the altemator by the
HARHESS
COMMECTOR
OHMMETER
VOLTMETER
POS.
FIGURE 9.2 •. VOLT· OHMMETER TEST
TYPICAL
BATTERY
JUMPER
LEAD
FIGURE 9.25. JUIoIPER COMMECTIOH
ELECTRICAL SYSTEM
ISSUED: 8118m
3817