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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 circuits should do so.
Injury or damage to equipment
may result otherwise.
Block 1
Turn battery master off
Flow Chart Sheet 3
Electrical Power
DA20-C1 AMM
Page 104
19 Dec 1997 24-30-00 Doc # DA201-C1
Rev. 0
FAULT: Generator warning
light inop, engine not running
and Gen/Batt Master switch
on. Refer to chapter 92 Dwg.
22-2400-99-00 sheet 1 for
wiring schematic. Refer to MM
Chapter24-00 for component
location.
Ac c e p t a b le r e s i s ta n c e
measurments for 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 circuits should do so.
Injury or damage to equipment
may result otherwise.
Select
only battery master
to on. Does Gen
warning light
illuminate?
No
See
MM24-30
sheet 3
Block 1
Yes
Select Gen master
switch to on. Remove
connector from the
generator. Touch or
jumper the end of wire
#24316A20 to a
known good ground
point.
Does the
generator warning
light
illuminate?
are the pins in the
connector in good
condition?
Is
pin L on
generator clean? Does
generator chassis
have a good
ground?
Replace damaged pins
Yes
Clean connections on
generator or grounds
on generator chassis
Yes and engine block.
Replace generator Ref.
MM 24-30.
No
No
Check
continuity of
wire # 24304A20 between
the generator
and Gen warning relay
GO2430-04.
Ok?
Replace generator warning
relay Ref MM 24-30.
Yes
Repair wiring between
generator and gen warning
relay
No
No Yes
Flow Chart Sheet 4
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 105
19 Dec 1997
FAULT: Unable t o b r ing
g e n e r a t o r o n l i n e , n o
generator warning light. Refer
to chapter 92 Dwg. 22-2400-
99-00 sheet 1-1 for wiring
schematic. Refer to MM 24-00
for component location
A c c e p t ab l e r e s i s t a n c e
measurments for 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 circuits should do so.
Injury or damage to equipment
may result otherwise.
Remove cowling.
Visually inspect
generator for loose
connections, Check
belt tension Ref.
chapter 20.
Check
resistance
between generator and
ground stud on engine
firewall.
Ok?
Replace or clean
No poor contact areas
Yes
Check
wire and bus bar
connection at generator
circuit breaker
GO2430-02
Ok?
Replace or clean
Yes No poor contact areas
Connect a volt meter to the
line ( generator ) side of the
generator circuit breaker.
Prepare to run the engine.
Note: Only qualified
personnel familiar with
aircraft flight manual should
operate this aircraft.
Run
the engine.
Select the Gen Master
to on. Is 14 volts
+/- .25 volts
present?
Yes
No
Replace the generator.
Ref. MM 24-30
Verify
aircraft voltmeter is
accurate.
Ok?
Replace generator
circuit breaker Ref.
MM 24-60
Yes
Replace Voltmeter
No Ref. MM 24-31
Flow Chart Sheet 5
Electrical Power
DA20-C1 AMM
Page 106
19 Dec 1997 24-30-00 Doc # DA201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 201
19 Dec 1997
MAINTENANCE PRACTICES
1. General
This part gives you the data to remove/install and adjust/test the components of the DC electrical
generation system on the airplane. Refer to the component manufacturer’s manuals for more data
and shop data.
2. Electrical Safety
The DA20-C1 has a low-voltage DC electrical system. When correctly maintained it is safe to work
on. But the battery can supply heavy current through low-resistance circuits (for example, if you
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