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% Trouble Shooting % 1. General
% The table below lists the defects you could have with the generating system. If you have the trouble % detailed in the Trouble column read across to the Possible Cause column. Then do the repair given % in the Repair column.
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Trouble  Possible Cause  Repair 
Alternator warning light illuminated.  Alternator defective.  Refer to the engine manufacturer. 
Alternator fuse failed.  Replace the fuse. If the fuse fails again, do resistance tests between the relay junction box bus and ground. Repair the defective cable or component. 

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% Maintenance Practices % 1. General
% This Section gives you the data to remove/install and adjust the components of the 14 VDC electrical % generation system on the airplane. 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 12 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.
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% 3. Remove/Install the Alternator Excitation Battery
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% A. Remove the Alternator Excitation Battery %

Detail Steps/Work Items  Key Items/References 
(1)  Remove the engine cowlings.  Refer to Section 71-11. 
(2)  Disconnect the airplane main battery: S Disconnect the negative cable from the battery. S Disconnect the positive cable from the battery. 
(3)  Remove the instrument panel cover.  Refer to Section 25-10. 
(4)  Disconnect the alternator excitation battery: S Disconnect the negative cable from the battery. S Disconnect the positive cable from the battery. 
(5)  Release the battery hold-down clamp. 
(6)  Remove the battery. 

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% B. Install the Alternator Excitation Battery %

Detail Steps/Work Items  Key Items/References 
(1)  Put the battery in position on the instrument panel shelf. 
(2)  Install the battery hold-down clamp. 
(3)  Connect the alternator excitation battery: S Connect the positive cable to the battery. S Connect the negative cable to the battery. 
(4)  Install the instrument panel cover.  Refer to Section 25-10. 
　
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