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26SI Series Alternator – T5 Alternator Current – Test

  1. Turn the keyswitch to the OFF position.
  1. Connect the 9U-5795 Current Probe to a DMM (digital multimeter) or use a 225-8266 Ammeter Tool Gp . Clamp the probe around the alternator output wire (“B+”). Before you clamp the probe around the wire, ensure that the probe is “zeroed” .
  1. 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”.

  1. 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 alternators 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”.