Cessna T182 Series Service Manual page 425

MODEL 182 & T182 SERIES SERVICE MANUAL
16-33.
TROUBLE SHOOTING.
TROUBLE PROBABLE CAUSE
REMEDY
STARTER ENGAGES WHEN
Shorted or reversed diode in
Check wiring to, and condition of
GROUND POWER IS CON-
split bus-bar system.
diode mounted on the split bus
NECTED.
relay bracket adjacent to the
magneto switch. Correct wiring.
Replace diode board assembly.
GROUND POWER WILL NOT
Ground service connector 1.
Check for voltage at all
CRANK ENGINE.
wired incorrectly. three terminals of external
power contactor with ground
power connected and master
switch off. If voltage is pre
sent on input and coil termi-
nals but not on the output ter-
minal, proceed to step 4. If
voltage is present on the input
terminal but not on the coil
terminal, proceed to step 2.
If voltage is present on all
three terminals, check wiring
between contactor and bus.
2. Check for voltage at small
terminal of ground service re-
ceptacle. If voltage is not pre-
sent, check ground service plug
wiring. If voltage is present,
proceed to step 3.
Open or mis-wired diode on
3. Check polarity and continuity
ground service diode board
of diode on diode board at rear of
assembly. ground service receptacle. If
diode is open or improperly wired.
replace diode board assembly.
Faulty external power con-
4. Check resistance from small
tactor.
(coil) terminal of external power
contactor to ground (master switch
off) and ground power unplugged.
Normal indication is 16-24 ohms
on the 12 volt and 50-70 on the 24
volt. If resistance indicates an
open coil, replace contactor. If
resistance is normal. proceed to
step 5.
Faulty contacts in external
5. With master switch off and
power contactor.
ground power applied, check for
voltage drop between two large
terminals of external power
(turn on taxi light for a load).
Normal indication is zero volts.
If voltage is intermittently pre-
sent or present all the time,
replace contactor.
16-19