SPRING 3669670 - Caterpillar

Remove the bolt that holds down the backup battery with the 9/32 socket. See Illustration 3.
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Starting to pry the battery out of the ECM with a putty knife
Slide a putty knife between the ECM and the backup battery, and pry up and down until sufficient space exists for the tip of a flat head screwdriver. See Illustration 4.
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Prying the battery out of the ECM with a flat head screwdriver
Insert the tip of a flat head screwdriver and pry up and down until the backup battery is free from the ECM. See Illustration 5.
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Removing the battery wire from the ECM and placing the battery beside the ECM
Pull the backup battery wire out of the ECM and place the backup battery on the side of the ECM. See Illustration 6. Note: The battery wire fits snugly in the ECM. Pull the battery wire out of the ECM carefully.
Perform the following in order to test the backup battery voltage:
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Test points of the battery
Locate the test points on the back side of the connector. See Illustration 7. Note: Red is the positive test point and black is the negative test point.
Turn on the multimeter.
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Multimeter probes and the test points of the battery
Contact the red probe of the multimeter to the red test point and the black probe of the multimeter to the black test point. See Illustration 8.
Observe the displayed backup battery voltage. Note: Check the backup battery voltage while the backup battery is still connected to the ECM. Do not unplug the backup battery until the voltage is verified. The ECM Backup Memory will be erased if the voltage falls to approximately 2.5 volts DC. The backup battery voltage should be between 3 volts DC and 3.6 volts DC. Backup battery voltage that is below 3 volts DC is considered to be too low. Replace a backup battery that has too low voltage.
Perform the following in order to replace the backup battery:
Locate the Release tab on the backup battery side of the connector.
Firmly grip both sides of the connector and press on the Release tab. Note: Disconnecting the connector by holding the wires at the back of the connector can cause these wire connections to be damaged.
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Separating the battery wire from the ECM connector
Separate the backup battery wire from the ECM connector. See Illustration 9.
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Battery
Acquire a new backup battery. See Illustration 10.
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Connecting the battery wire to the ECM connector
Connect the backup battery wire to the ECM connector. See Illustration 11.
Test the backup battery voltage in accordance with Step 12. Note: If this backup battery voltage is not between 3.4 volts DC and 3.6 volts DC then this replacement backup battery should not be installed. Acquire a different backup battery and go to Step 13.e.
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Feeding the battery wire into the ECM
Carefully feed the wire back inside the ECM. See Illustration 12.
Position the newbackup battery at the hole for the backup battery in the ECM and line up the holes for the bolt. Note: