RING 9P7256 - Caterpillar

Engine: 3116 (S/N: 4PG3542-UP; 2MR277-UP) 3126B (S/N: BEJ154-UP; DCS739-UP) 3176C (S/N: 2AW375-UP) 3196 (S/N: 1DW483-UP) 3304 (S/N: 04B27163-UP; 23C2672-UP; 66D50755-UP; 67U10731-UP; 38S17134-UP; 4XB1081-UP; 10E2942-UP) 3306 (S/N: 64Z2682-UP; 85Z8567-UP) 3306B (S/N: 7JB8011-UP; 5GZ314-UP) 3408E (S/N: 7PR414-UP) 3412E (S/N: 4CR500-UP) 3508B (S/N: ZAD245-UP) 3512 (S/N: ZAF114-UP) 3512B (S/N: BLF176-UP) 3516 (S/N: 8TW1-UP) 3516B (S/N: FDN1322-UP; 7RN1953-UP; ZAP186-UP; 2JW414-UP; 8NW1-UP) C-10 (S/N: BCX130-UP) C-12 (S/N: BDL156-UP) C-9 (S/N: CLJ306-UP) C7 (S/N: JRA288-UP; JTF387-UP) C9 (S/N: X3R1-UP) G3408C (S/N: BAZ2218-UP) G3520B (S/N: BGW1-UP)Generator Set: 3406 GEN SET (S/N: 4ZR351-UP) 3406C GEN SET (S/N: KPS2010-UP; 9ES1-UP; LRX1-UP) 3456 GEN SET (S/N: BGA1-UP; CCB481-UP; CAH1-UP; CBX620-UP) C15 GEN SET (S/N: PEC101-UP; X4R1-UP) C15 PET GS ENG (S/N: PET101-UP) C18 GEN SET (S/N: STD149-UP; PEJ101-UP; STM1-UP) C27 GEN SET (S/N: DWB233-UP)Industrial Engine: 3406B IND (S/N: 6TB5569-UP) 3406C IND (S/N: 3ER525-UP) 3406E IND (S/N: 6BR616-UP) 3412E IND (S/N: BDT4483-UP) C-15 IND (S/N: BEM135-UP) C-16 IND (S/N: BFM148-UP) C13 INDUSTRIAL (S/N: LGK319-UP) C15 IND (S/N: JRE102-UP) C18 INDUSTRIAL (S/N: WJH101-UP) C9 INDUSTRIAL (S/N: JSC108-UP; MBD146-UP)Marine Engine: 3408C MARINE (S/N: 9ER311-UP)Power Module: PM3508 (S/N: BLM244-UP)Introduction
This Special Instruction describes the procedure that is used in order to restore the residual magnetic field in the alternator.Description
Charging problems may be encountered when you install brushless alternators that are new or remanufactured. The alternators may not begin to charge in some instances. The alternators may be considered faulty. Brushless alternators are self-excited. Self-excited alternators begin to charge at start-up, without the use of an external power source. Self-excited brushless alternators use residual magnetism in order to generate sufficient current to start the charging process. Charging problems with these alternators usually result when the residual magnetic field in the alternator is reduced below the level that is needed to excite the alternator. The following factors can lead to residual magnetism that is reduced:
Rough handling
Storage temperatures above approximately 38° C (100° F)
Extended storage periods of more than three to six months
Manufacturing tolerances in the alternator
Disassembled for repairProcedure
Before returning or replacing a brushless alternator for failing to charge, use an external power source to restore the residual magnetic field. Use a jumper wire in order to connect the positive "+" output terminal of the alternator to the "R-Terminal" of the alternator for approximately two seconds. Refer to Illustration 1. This temporary connection should provide sufficient current from the vehicle batteries in order to restore the residual magnetic field in the alternator. If the alternator failed to charge due to one of the causes above, this procedure should restore residual magnetism. If the residual magnetism is restored, self-excitation will occur at the next start-up.
Illustration 1 g01652497
Note: The unit must not be rotating while the field is being flashed. If you rotate the alternator during this procedure, you may damage the unit. The unit should be electrically connected. The unit must have battery voltage at "B+" and the unit must be properly grounded. Touch a jumper wire from "B+" to the "R-Terminal" for no more than two seconds. Be careful not to touch ground (case) with the ends