Restoring the Residual Magnetism
(1) Jumper wire
Reduced 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 (1) to the “B+” terminal.
- Connect the other end of the jumper wire 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