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1. General
This Section tells you how to remove/install the external power relay. Refer to the component manufacturers manuals for more data and shop data.
2. Electrical Safety
The DA 40 has a low voltage DC electrical system. When correctly maintained it is safe to work on. The battery can supply heavy current through low resistance circuits (for example, if you ground the positive output with a wrench by accident).
Always follow the usual safety practices for working on electrical equipment. Allow only qualified persons to maintain the electrical system.
CAUTION:  DISCONNECT THE BATTERY BEFORE DOING MAINTENANCE ON THE ELECTRICAL SYSTEM. MAKE SURE THAT YOU DISCONNECT THE NEGATIVE LEAD FIRST.
CAUTION:  AFTER DOING ELECTRICAL MAINTENANCE ALWAYS DO A CONFIDENCE TEST OF THE SYSTEM WITH A 24 VOLT POWER SUPPLY THAT HAS OVER-CURRENT PROTECTION. DO THIS BEFORE CONNECTING THE BATTERY
CAUTION:  USE ONLY DA 40 SPARE PARTS APPROVED BY THE MANUFACTURER.
3. Remove/Install the External Power Relay
A. Remove the External Power Relay
Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-10. 
(2)  Disconnect the battery: S Disconnect the negative cable from the battery. S Disconnect the positive cable from the battery. 
(3)  Remove the cover from the relay box. 

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Detail Steps/Work Items  Key Items/References 
(4)  Disconnect the electrical cables from the external power relay. 
(5)  Remove the 2 bolts which attach the external power relay to the relay box. 
(6)  Move the relay clear of the airplane. 

B. Install the External Power Relay
Detail Steps/Work Items  Key Items/References 
(1)  Put the relay in position in the relay box. 
(2)  Install the 2 attaching bolts. 
(3)  Connect the power and control cables to the external power relay.  Refer to Chapter 92 for the wiring diagrams. 
(4)  Install the cover to the relay box. 
(5)  Connect the positive cable to the battery.  Apply Dow Corning compound (DC4) to the battery terminal and the cable lug. 
(6)  Connect the negative cable to the battery.  Apply Dow Corning compound (DC4) to the battery terminal and the cable lug. 
(7)  Install the engine cowlings.  Refer to Section 71-10. 
(8)  Do a function test of the external power relay: S Connect an 28 V DC external power supply to the external power socket. S Set the ALT/BAT switch to ON. S The airplane voltmeter must show 28 V. S Remove the external power supply. S The airplane voltmeter must show 24 V. S Set the ALT/BAT switch to OFF. 

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% Section 24-41 % External Power - TAE 125 Diesel Engine % 1. General
% The DA 40 has an external power socket located on the left side of the fuselage, near the relay % junction box. It is a standard 14 Volt DC power socket. When you connect external power to the % external power socket, the external power control relay is energized and the external power comes % on-line.
% 2. Description and Operation
% Figure 1 shows a simple schematic diagram of the external power system. The external power system % has these components:
% A. 14 Volt Socket
% The 14 VDC power socket is located on the left side of the fuselage, near the relay junction box. % The socket has 3 pins:
%) A large negative pin.
%) A large positive pin.
%) A small positive pin.
% A diode connected between the small positive pin and the external power relay solenoid protects % the system from reverse polarity.
% B. External Power Relay
　
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