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the main bus voltage.
(2) Set the GEN/BAT switch to ON. The GEN warning light must come on.
(3) Start the engine. Refer to Chapter 71-00.
(4) Set the engine speed to 1720 RPM. The ammeter must show a positive
reading.
(5) When the battery has charged, measure the
generator voltage.
The voltage must be 14 volts ± 2%.
(6) Set all electrical loads to ON.
(7) Operate intermittent loads throughout this
part of the test. Operate the trim, flaps,
transmitters.
The voltage must remain within 2.5% of the
no-load generator voltage.
The ammeter must not show a discharge.
(8) Shut-down the engine. Refer to Chapter 71-00.
The GEN warning light must come on.
(9) Set the GEN/BAT switch to OFF.
(10) Disconnect the voltmeter.
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 4 24-31-00 Page 1
12 Jan 2001
CHAPTER 24-31
BATTERY SYSTEM
1. General
This Section tells you about the battery system. See Chapter 24-00 and 24-30 for the description
and operation of the battery in the electrical generation system.
The battery is located in a battery box aft of the baggage compartment or optionally mounted at the
left side of the firewall. When the generator voltage is greater than the battery voltage, the
generator charges the battery. If a non-sealed battery is installed, a vent hose connects the battery
to the outside air through the bottom of the fuselage.
The ammeter and voltmeter monitor the battery. The ammeter shows the current flowing to or from
the battery. The voltmeter shows the voltage on the main bus. When the generator is operating, it
shows the generator voltage. When the generator is off-line, it shows the battery voltage.
The battery supplies current to the main bus through the battery relay. The battery relay is in a
relay box in the B-bulkhead. A 50 amp circuit-breaker protects the battery system.
Regular maintenance is necessary for the battery. Do not wait until a starting problem occurs.
Electrical Power
DA20-C1 AMM
Page 2
24 Mar 1999 24-31-00 Doc # DA201-C1
Rev. 1
Figure 1 - Battery Installation
DA20-C1 AMM
Electrical Power
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12 Jan 2001
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Rev. 9
Starter Relay
(See also Chapter 80)
Positive Cable
Anchor Strap
Ground Connection
Starter
Battery Tray
Battery Vent
Battery Tray Drain
Master Relay
Negative Cable
Battery
For non-sealed
Battery only
Figure 2 - Firewall Mounted Battery Installation
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-31-00 Page 101
19 Dec 1997
TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the battery.
Complaint Possible Cause Remedy
Battery voltage low. Battery electrolyte level low.
Battery capacity low.
Generator output low.
Fill to the correct level.
Do a capacity test. If
necessary, replace the
battery.
Trouble-Shoot the generator.
Refer to Chapter 24-30.
Battery uses too much water. Generator output high. Replace the generator. Refer
to Chapter 24-30.
Battery will not connect to the
main bus.
Battery circuit-breaker open.
Battery circuit-breaker
defective.
Battery relay defective.
BAT GEN switch defective.
Wiring between the BAT GEN
switch and the battery relay, or
the BAT GEN switch and
ground defective.
Close the circuit-breaker.
Replace the circuit-breaker.
Refer to Chapter 24-60.
Replace the battery relay.
Replace the BAT GEN switch.
Do a continuity test of the
wiring. Repair or replace
defective wiring.
Ammeter shows zero at all
times.
Defective ammeter. Replace the ammeter.
Voltmeter shows zero at all
times.
Defective voltmeter.
Defective wiring between the
ammeter and voltmeter, or
voltmeter and ground.
Replace the voltmeter.
Do a continuity test of the
wiring. Repair or replace
defective wiring.
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MAINTENANCE PRACTICES
1. General
Keep the battery clean. Remove electrolyte from the outside of the battery. Remove dirt from the
area of the terminals. Protect the terminals and cable lugs with Dow Corning compound 4 (DC4).
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