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Page 7

TG0048A

Notes

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Page 7

TG48B

If you have questions about your alternator or any of these test procedures, or if you need to locate a Factory Authorized Service Distributor, please contact us at: 

C. E. Niehoff & Co.• 2021 Lee Street • Evanston, IL 60202 USA 

 

TEL: 800.643.4633 USA and Canada • TEL: 847.866.6030 outside USA and Canada • FAX: 847.492.1242

 

E-mail us at [email protected]

Summary of Contents for C520

Page 1: ...ing obtained Be sure the meter leads touch source area only Prevent short circuit damage to test leads or source by not allowing meter leads to touch other pins or exposed wires in test area Be sure t...

Page 2: ...es field current preventing an abrupt mechani cal load on accessory drive system The soft start may take up to 20 seconds A2 215 regulator used with some of these units is flat temperature compensated...

Page 3: ...4 J1939 Connector Pins Regulator Readout Expected Reading TABLE 2 A2 326 Regulator J1939 Readout Diagnostics seeTable 3 Alternator Output Voltage 28 V System Alternator Speed Regulator Temperature Alt...

Page 4: ...s to normalize operating temperature 6 Observe charge volts and amps Charge voltage should increase and charge amps should decrease If charge voltage does not in crease within ten minutes continue to...

Page 5: ...for system voltage at IGN terminal on regulator If OK replace regulator If not OK check vehicle wiring and ignition circuit Energize signal present alternator not rotat ing or alternator speed too low...

Page 6: ...ective T T Alternator is defective T T With key off engine off Does battery voltage exist at alternator B terminal Yes No Repair vehicle harness circuit to B terminal on alterna tor T T Momentarily 1...

Page 7: ...f these test procedures or if you need to locate a Factory Authorized Service Distributor please contact us at C E Niehoff Co 2021 Lee Street Evanston IL 60202 USA TEL 800 643 4633 USA and Canada TEL...

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