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737-300/400/500MAINTENANCE MANUAL
 D. Do a Test of the Charge Mode
 S 765-005
 (1)  As the battery charges, look for an indication of more than 26 amps on the dc ammeter.
 NOTE: A dead battery can charge for 60 minutes.
____
 S 765-006
 (2)  When the battery is fully charged, make sure that the battery charger goes into the pulse mode.
 (a)  
The dc ammeter indication will decrease to 0 amps.

 (b)  
Then, the dc ammeter indication will increase to 13 - 36 amps.

 (c)  
These pulses will occur 8 times, approximately 10 seconds apart.

 NOTE: The time between the battery charger pulses can vary due
____ to the state of battery charge.
 S 765-007
 (3)  After the pulses stop, make sure that the battery charger goes into the transformer-rectifier mode.
 (a)  
The dc voltmeter indication will stay constant at 28 | 2 volts.

 (b)  
The dc ammeter indication will stay constant at approximately 0 amps.

 E. Do a Test of the Protection Mode
 S 865-023
 (1)  
Push the STANDBY POWER switch to BAT.

 (2)  
Open the electronic equipment access door.

 (3)  
Remove the small battery connector D2936 from the battery.

 S 485-011

 (4)  
Connect a jumper wire between the pins 1 and 2 of the small battery connector.

 S 015-008
 S 035-009
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 S 765-032
 (5)  
Make sure that the dc ammeter shows a negative value.

 S 085-012

 (6)  
Remove the jumper wire that is between pins 1 and 2 of the small battery connector.

 S 435-013

 (7)  
Connect the small battery connector to the battery.

 S 765-033

 (8)  
Make sure that the dc ammeter shows a positive value again.

 S 415-014

 (9)  
Close the electronic equipment access door.

 F.
Do a Test of the Transformer-Rectifier Mode

 S 865-026
 (1)  
Push the APU GEN 1 and 2, or the GEN 1 and 2 switches to OFF to remove the power from the battery charger.

 S 865-028

 (2)  
Let a minimum of 15 seconds go by.

 NOTE: This will drain the battery sufficiently to put the battery
____
 charger into the pulse mode again.

 S 865-029
 (3) Push the APU GEN 1 and 2, or the GEN 1 and 2 switches to ON.
 (a)  Make sure that the dc ammeter indication stays constant (no pulses) for 20 seconds.
 S 865-037
 (4)  Push the STANDBY POWER switch to AUTO.
 (a)  Make sure that the battery charger goes into the pulse mode.
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737-300/400/500MAINTENANCE MANUAL
 G.  Put the Airplane Back to Its Usual Condition S 865-020
 (1)  
Turn the dc meters switch to TR1.
 S 865-021

 (2)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

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