PUMP & MTG GP-HYDRAULIC FAN 4555293 - Caterpillar

Illustration 1 g01066183
Restoring the Residual Magnetism (16) Jumper WireReduced residual magnetism results in charging problems during start-up. Follow the procedure below in order to restore the residual magnetism of the alternator.
Connect the positive terminal of a 24 volt battery to the "B+" terminal of the alternator.
Connect the negative terminal of a 24 volt battery to the "B-" terminal of the alternator.
Connect one end of jumper wire (16) to the "B+" terminal.
Connect the other end of the jumper wire (16) to the "R" terminal. A spark occurs as the jumper wire touches the "R" terminal. If a spark does not occur, the alternator has an internal open.
Wait for two seconds.
Disconnect the jumper wire from the "R" terminal. Expected Result: The residual magnetism is restored.Alternator Residual Magnetism Loss
The residual magnetism is reduced by the following conditions:
Dropping the alternator
Handling the alternator roughly
Storing the alternator at temperatures above 38 °C (100 °F)
Storing the alternator for longer than 3 to 6 months
Disassembling the alternator for repairs or for testing
Having an alternator with poor manufacturing tolerances