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IDENT
VFR
0 1 2 3 4 5 6 7 8 9
START
FUNC CRSR
CLR
STOP
ALT
OFF
GARMIN
STBY
ON
GTX 327
ALT 1200
R
PRESSURE ALT
12300 ft
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AVIONICS
CONTROL
GEN.
COM 2 GPS 2
ELECTRICAL
GEN. BATTERY
CDI
EQUIP
OIL PRESS
FUEL PRESS
ENGINE
POSITION
COM 1
STROBE
LIGHTS
TAXI/MAP
CONTROL ICS
MASTER MASTER
LANDING
ATC
AVIONICS
INST.
FLAPS TRIM
SLIP
SYSTEM
O.A.T.
FUEL QTY. TURN
&
START
SYSTEM
1
GPS/NAV
HORIZON DG
PUMP
FUEL
HEAT
PITOT
EGT
OIL TEMP TACH.
COOLING
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-60-00 Page 101
19 Dec 1997
TROUBLE-SHOOTING
1. General
Use these flow-charts to trouble-shoot the electrical distribution system.
Connect volt meter to
battery. Select master
switch to off
Ref. MM 24-31 Is battery
voltage low? Yes Recharge battery as per
MM 24-31
No
Select Batt
master to on. Is battery
voltage present on the bus
side of the battery
relay
Yes
No
Is
battery voltage
present on the bus
side of the
ammeter?
Replace battery
circuit breaker Ref.
MM 24-60
Yes
No Replace Ammeter Ref.
MM 24-31
Ref. 20-2400-00-00 Sh. 1.
Disconnect the battery.
Disconnect wire
#24301A20N from battery
relay coil. Select Batt
master switch on. Using an
ohm meter check wire
#24301A20N for continuity
between the battery relay
coil terminal and ground.
Continuity ? Yes Replace battery relay Ref.
MM 24-60
No
Check
continuity of wire
# 24324A20N between
Batt master switch and
ground. Is there
continuity?
Replace Gen/Batt Master
switch as per
MM 24-30
Is
there continuity
of wire #24301A20N
between battery relay coil
and Batt master sw.
GC2430-02?
No
Yes
Repair wire # 24301A20N Repair wire # 24324A20N
No
Yes
F AU L T : U n a b l e t o
connect the battery to the
main bus. Refer to chapter
92 Dwg. 22-2400-99-00
s h e e t 1 f o r w i r i n g
schematic. Refer to MM
2 4 - 0 0 F i g . 2 f o r
component location.
Acceptable resistance
m e a s u r m e n t s f o r
continuity and resistance
to ground is .005 ohms or
less. Use a calibrated
digital volt ohm meter for
measurments
CAUTION
Only those familiar with
safety practices while
working on live electrical
c i rcui ts should do so.
I n jur y o r damage t o
equipment may result
otherwise.
Flow-Chart Sheet 1
Electrical Power
DA20-C1 AMM
Page 102
19 Dec 1997 24-60-00 Doc # DA201-C1
Rev. 0
Remove instrument
panel cover.
Select avionics
master switch to off.
Disconnect wire
#24503A20 from
avionics master relay
AM2460-03
Using
an ohmmeter
check wire #24503A20.
Is there continuity from
relay AM2460-03
to ground?
Remove wire
#24502A20 from relay
AM2460-03. Is battery
voltage present at the
relay end of the
wire?
Replace relay AM2460-03
No Ref. MM24-60
Is voltage
present on the load
side of the avionics master
control circuit
breaker?
Repair wire #24502A20
between circuit breaker and
relay AM2460-03
Replace circuit breaker
Ref. MM24-60
No
Yes
Yes
Is there
continuity on wire
#24504A20N from
avionics master switch
AM2460-04 to
ground?
Yes
Replace avionics master
switch AM2450-04 or repair
wire #24503A20
No Yes
No
Repair wire #24504A20N
between avionics master
switch and ground.
FAU L T : A vi o n ic s bus
powered with Battery Master
on and Avionics Master
selected to off. Refer to
chapter 92 Dwg. 22-2400-
99-00 sheet 1 for wiring
schematic. Refer to MM 24-
00 Fig. 2 for component
location
Acceptable resistance
measurments for continuity
and resistance to ground is
　
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