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% When the ECU bus voltage is greater than the battery voltage, the bus charges the battery.
% The battery supplies current to the ECU B through the ECU alternate power relay. The relay is on the % instrument panel shelf. A 30 A fuse protects the circuit.
% In the usual operation, 14 V on the ECU bus closes the ECU alternate power relay. This connects the % ECU bus to the battery through a diode and a resistor. The diode prevents the battery discharging % back through the system. The resistor limits the charging current.
% If the power fails on the ECU bus, the relay de-energizes and connects the battery to the ECU B. It % also breaks the charging circuit.
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%  Trouble-Shooting 
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%  1. General 
% % % %  The table below lists the defects you could have with the battery 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 
Main battery voltage low.  Battery capacity low. Alternator output low.  Do a capacity test. If necessary, replace the battery. Trouble-Shoot the alternator, refer to Section 24-33. 
Main battery will not connect to the ECU bus.  Battery relay defective. ELECTRIC MASTER key switch defective. Battery system wiring defective.  Replace the battery relay. Replace the ELECTRIC MASTER key switch. Do a test of the battery system wiring. Refer to Chapter 92 for the wiring diagrams. 
Main battery will not connect to the hot battery bus.  100 A fuse failed.  Replace the 100 A fuse. If the fuse fails again, do a test for a short circuit between the hot battery bus and ground. Repair or replace the defective component. 
Ammeter shows zero at all times.  Defective ammeter. Defective ammeter transducer.  Replace the integrated engine display. Replace the transducer. 
Voltmeter shows zero with ENGINE MASTER switch set to ON.  Defective voltmeter. Defective wiring in the voltmeter system.  Replace the integrated engine display. Do a test of the wiring. Refer to Chapter 92 for the wiring diagrams. 

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Trouble  Possible Cause  Repair 
ECU backup battery voltage low.  Battery capacity low. Alternator output low.  Do a capacity test. If necessary, replace the battery. Trouble-shoot the alternator, refer to Section 24-33. 
ECU backup battery will not connect to the ECU B during test.  ECU alternate power relay defective. ENGINE MASTER switch defective. ECU backup battery system wiring defective.  Replace the battery relay. Refer to Section 24-33. Replace the ENGINE MASTER switch. Refer to Section 24-33. Do a test of the battery system wiring. Refer to Chapter 92 for the wiring diagrams. 

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% Maintenance Practices % 1. General
% Keep the battery clean. Remove grease and other contaminants from the battery case. Remove dirt % from the area of the terminals. Protect the terminals and cable lugs with Dow Corning compound 4 % (DC4).
% If you do not use the airplane regularly you must remove the battery for charging.
　
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