Piper Navajo PA-31 Service Manual page 780

PIPER NAVAJO SERVICE MANUAL
I I -\BLE XI-1. TROUBLESHOOTING
CHART (ELECTRICAL SYSTEM) (cont.)
Trouble
Cause
Remedy
Battery polarity
re-
versed.
Battery consumes ex-
cessive water.
Connected backwards
on airplane or charger.
Charging rate too high
(if in all cells).
Battery should be slowly
discharged completely
and then charged cor-
rectly and tested.
Correct charging rate.
Cracked jar (one cell
Replace battery.
only).
BATTERY-DISCONNECT
SOLENOID
Does not operate.
Open circuit.
Repair wiring.
Dirty contacts on con-
nector plug.
Open-circuited solenoid
coil.
Plunger binding.
Clean contacts.
Replace unit.
Remove and wash plung-
er and housing thor-
oughly with carbon tet-
rachloride.
Change
spring compression
only as a last resort.
Intermittent
operation. Short-circuited
coil.
Loose electrical
con-
nection.
Replace coil.
Clean and
tighten electrical con-
nections.
Plunger binding.
See remedy pertainingto
"Plunger binding" under
"Does not operate."
ELECTRICAL SYSTEM
Revised: 10/12/83
4E6