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(3) Connect the control and power wires to the
relay.
Refer to Chapter 92 for wiring diagrams.
(4) Install the cover to the relay box.
(5) Connect the battery. Connect the positive cable first.
(6) Install the cover to the battery.
(7) Do a test for correct operation of the battery
relay.
C. Battery Relay Functional Test
Do this test in an area where the engine can be run.
Detail Steps/Work Items Key Items
(1) Make sure the GEN/BAT switch is set to
OFF.
There must be no indication on the
voltmeter.
(2) Set the GEN/BAT switch to ON. The voltmeter must indicate battery
voltage.
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-31-00 Page 205
19 Dec 1997
Detail Steps/Work Items Key Items
WARNING: MAKE SURE THAT THE AREA OF THE PROPELLER IS CLEAR
BEFORE YOU OPERATE THE STARTER MOTOR. PROPELLERS
CAN CAUSE INJURY OR DEATH
(3) Operate the starter motor. You do not need to start the engine.
5. Remove/Install the Ammeter
A. Remove the Ammeter
Detail Steps/Work Items Key Items
(1) Disconnect the battery Disconnect the negative cable first.
(2) Remove the instrument panel cover for
access.
Refer to Chapter 25-10.
(3) Disconnect the wires from the ammeter.
(4) Release the ring which attaches the
ammeter.
(5) Remove the ammeter.
B. Install the Ammeter
Detail Steps/Work Items Key Items
(1) Put the ammeter in position in the instrument
panel.
(2) Install the ring which attaches the ammeter.
(3) Connect the wires to the ammeter. Refer to Chapter 92 for wiring diagrams.
(4) Connect the battery. Connect the positive cable first.
(5) Do a test for correct operation of the
ammeter.
Refer to paragraph C.
(6) Install the instrument panel cover. Refer to Chapter 25-10.
Electrical Power
DA20-C1 AMM
Page 206
19 Dec 1997 24-31-00 Doc # DA201-C1
Rev. 0
C. Ammeter Functional Test
Do this test in an area where the engine can be run. Only persons approved by the
airworthiness authority can do engine runs.
Detail Steps/Work Items Key Items
(1) Make sure the GEN/BAT switch is set to
OFF.
There must be no indication on the
ammeter.
(2) Set the GEN/BAT switch to ON. The ammeter must show a discharge (-).
WARNING: MAKE SURE THAT THE AREA OF THE PROPELLER IS CLEAR
BEFORE YOU OPERATE THE STARTER MOTOR. PROPELLERS
CAN CAUSE INJURY OR DEATH.
(3) Start the engine. Refer to the airplane flight manual for
procedures.
(4) Increase the engine RPM to bring the
generator on-line.
The ammeter must show a charge (+).
(5) Stop the engine. Refer to the airplane flight manual for
procedures.
6. Remove/Install the Voltmeter
A. Equipment
Items Quantity Part Number
Calibrated DC voltmeter 1 Commercial
B. Remove the Voltmeter
Detail Steps/Work Items Key Items
(1) Disconnect the battery Disconnect the negative cable first.
(2) Remove the instrument panel cover for
access.
Refer to Chapter 25-10.
(3) Disconnect the wires from the Voltmeter.
(4) Release the ring which attaches the
Voltmeter.
(5) Remove the Voltmeter.
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-31-00 Page 207
19 Dec 1997
C. Install the Voltmeter
Detail Steps/Work Items Key Items
(1) Put the voltmeter in position in the
instrument panel.
(2) Install the attaching ring.
(3) Connect the wires to the voltmeter. Refer to Chapter 92 for wiring diagrams.
(4) Connect the battery. Connect the positive cable first.
(5) Do a test for correct operation of the
voltmeter.
Refer to paragraph D.
(6) Install the instrument panel cover. Refer to Chapter 25-10.
D. Voltmeter Functional Test
Detail Steps/Work Items Key Items
(1) Make sure the GEN/BAT switch is set to
OFF.
There must be no indication on the
voltmeter.
(2) Set the GEN/BAT switch to ON. The voltmeter must show battery voltage.
(3) Connect a test voltmeter to the terminals of
the voltmeter.
The airplane voltmeter must show the
same voltage as the test voltmeter.
(4) Set the GEN/BAT switch to OFF.
Electrical Power
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Rev. 0
Intentionally left blank
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 15 24-40-00 Page 1
30 Apr 2009
CHAPTER 24-40
EPU SYSTEM
1. General
The DA20-C1 has an external power receptacle located in one of two locations. Aircraft serial
numbers C0001 through C0148 and C0150 have this receptacle located on the fuselage at the rear
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