Troubleshooting The Battery Power System - Cessna T182 Series Service Manual

MODEL 182 & T182 SERIES SERVICE MANUAL
16-16. TROUBLE SHOOTING THE BATTERY POWER SYSTEM.
TROUBLE PROBABLE CAUSE
REMEDY
BATTERY WILL NOT SUPPLY
Battery discharged.
1. Measure voltage at "BAT"
POWER TO BUS OR IS INCAP-
terminal of battery contactor
ABLE OF CRANKING ENGINE.
with master switch and a suit-
able load such as a taxi light
turned on. Normal battery will
indicate 11. 5 volts or more on
a 14 volt system or 23 volts or
more on a 28 volt system.
If
voltage is low proceed to step
2. If voltage is normal, pro-
ceed to step 3.
Battery faulty.
2. Check fluid level in cells
and charge 12-volt battery at
14 volts or 24-volt battery at
28 volts for approximately 30
minutes or until battery voltage
rises to 14 volts on 12-volt bat-
tery or 28 volts on 24-volt bat-
tery. If tester indicates a good
battery, the malfunction may be
assumed to be a discharged bat-
tery. If the tester indicates a
faulty battery, replace the
battery.
Faulty contactor or wiring
3. Measure voltage at master
between contactor or master
switch terminal (smallest) on
switch.
contactor with master switch
closed. Normal indication is
zero volts. If voltage reads
zero, proceed to step 4.
If a
voltage reading is obtained
check wiring between contactor
and master switch. Also check
master switch.
Open coil on contactor.
4. Check continuity between "BAT"
terminal and master switch termi-
nal of contactor. Normal indication
on 14 volt aircraft is 16-24 ohms.
Normal indication on 28 volt air-
craft is 50-70 ohms. If ohmmeter
indicates an open coil. replace con-
tactor.
If ohmmeter indicates a
good coil, proceed to step 5.
BATTERY WILL NOT SUPPLY Faulty contactor contacts.
5. Check voltage on "BUS" side of
POWER TO BUS OR IS INCAP- contactor with master switch closed.
ABLE OF CRANKING ENGINE.
Meter normally indicates battery
voltage is zero or intermittant.
replace contactor. If voltage is
normal. proceed to step 6.
Faulty wiring between contactor
6. Inspect wiring between con-
and bus.
tactor and bus. Repair or re-
place wiring.
16-7