Piper Navajo Chieftain PA-31-350 Service Manual page 665

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE XI-V. TROUBLESHOOTING CHART (ELECTRICAL SYSTEM) (cont.)
Trouble
Cause Remedy
Battery polarity
reversed.
Battery consumes
excessive water.
Connected backwards
on airplane or
charger.
Charging rate too
high (if in all
cells).
Battery should be slowly
discharged completely and
then charged correctly
and tested.
Correct charging rate.
Cracked jar (one
cell only).
BATTERY-DISCONNECT SOLENOID
Replace battery.
Does not operate.
Open circuit.
Repair wiring.
Dirty contacts on
connector plug.
Open-circuited
solenoid coil.
Plunger binding.
Clean contacts.
Replace unit.
Remove and wash plunger
and housing thoroughly
with carbon tetrachloride.
Change spring compression
only as a last resort.
Intermittent
operation.
Short-circuited
coil. Loose elec-
trical connection.
Replace coil. Clean and
tighten electrical con-
nections.
Plunger binding.
Badly burned points.
See remedy pertaining to
"Plungerbinding" under
"Does not operate."
If points cannot be
dressed down, replace
the unit.
ELECTRICAL SYSTEM
Revised: 10/5/83
3E15