Piper Dakota Maintenance Manual page 190

CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Trouble
Battery installed with re-
versed polarity. (cont)
Excessive ammeter fluctua-
tion.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
Cause
Battery charged backwards.
Excessive resistance in field
circuit.
High field circuit resistance.
Defective voltage regulator.
1I5
Remedy
Remove battery. Connect
load such as landing light
lamp or similar load and dis
charge battery. Recharge
with correct polarity and test
each cell for signs of damage
due to reversed charging.
—NOTE—
This type of condition can
only occur in a case where a
discharged battery has been
rcmovcd from the airplane
and put on a charger with the
polarity reversed This re-
versal in polarity cannot
occur in the airplane due to
any fault in the alternator
system.
Check all connections and
wire terminals in field cir
cuit for deterioration such as
loose binding posts, broken
wire strands at terminals, etc.
Tighten all connections and
replace faulty terminals.
If problem persists, jump
across terminals of the fol-
lowing components one at a
time until the faulty unit is
isolated.
a. Field 5 amp (alternator)
circuit protector.
b. Alternator half of master
switch.
c. Overvoltage relay.
Replace voltage regulator.
24 - 02 - 00
Page - 24 - 06
Reissued: August 1, 1986