FUEL PUMP HOUSING SERVICE GROUP 7M4290 - Caterpillar

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Turn the key switch to the OFF position.
Connect the 9U-5795 Current Probe to a DMM (digital multimeter) or use the 225-8266 Ammeter Tool Gp . Clamp the probe around the alternator output wire ("B+"). Before clamping the probe around the wire, ensure that the probe is "zeroed" .
Read the current.Expected Result: The current is under 2 A.Results:
YES - The current is under 2 A. Continue to Step 4.
NO - The current is over 2 A. There is an internal problem with the alternator. Replace the alternator or go to Testing and Adjusting, "Component - Test".
Disconnect the B+ terminal wire from the alternator. Connect the red lead of the multimeter to the wire that was disconnected. Connect the black lead of the multimeter to the alternator B+ terminal. Set the multimeter on the 10 amp scale. Read the current. Expected Result: The current is under 0.015 A.Results:
YES - The current is under 0.015 A. The alternator is operating correctly. There is a current draw on the machine. Go to Testing and Adjusting, "T7 Identifying Source Of Current Draw - Test"
NO - The current is over 0.015 A. There is an internal problem with the alternator. Replace the alternator or go to Testing and Adjusting, "Component - Test".