Cen N1225 Troubleshooting Manual Download Page 7

Page: 7 / 7

Page 7

TG0017B

Notes

Page 7

TG17C

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 N1225

Page 1: ...ed 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 to use CEN tools designed especially for trou bleshooting CEN alternators when available Resistance ohm testing Set meter to proper scale Be sure to zero the meter scale or identify the meter burden by touching ...

Page 2: ...nsated Setpoints are 28 0 0 2 V and 14 0 0 2 V at 75 F provides overvoltage cutout OVCO Regulator will trip OVCO when system voltage rises above 32 V in a 28 V system 16 V in a 14 V system for longer than 2 seconds OVCO feature detects high volt age and reacts by signaling relay in F alternator circuit to open turning off alternator Restarting engine resets OVCO circuit maintains alternator output...

Page 3: ...running 4 Connect meters to alternator Connect red lead of DMM to alternator 28 V B terminal and black lead to alternator B termi nal Clamp inductive ammeter on 28 V B cable 5 Operate vehicle Observe charge voltage at batteries with engine running nom 27 28 V or 13 5 14 0 V If charge voltage is above 32V for 28V system or 16V for 14V system immediately shut down system Electrical system damage may...

Page 4: ...nd restart engine Does alternator function normally after restart Yes No Regulator responded to overvoltage condition Go to Chart 3 on page 6 to troubleshoot OVCO Figure 3 Alternator to Regulator 4 Socket Harness Plug SOCKET CONNECTIONS A F B Phase Signal AC C B D 28V B With key on engine running Test for battery voltage between IGN terminal on regulator and alternator B terminal Does 28 V battery...

Page 5: ... voltage exist Yes No Repair vehicle wiring as necessary Yes Set DMM to diode tester Connect red lead of DMM to socket C of regulator harness plug and black lead to each phase pin in phase harness plug Meter should show voltage drop value Then reverse meter lead connections Meter should show OL blocking No Alternator is defective Regulator is defective Figure 4 Alternator to Regulator 4 Socket Har...

Page 6: ...limits Alternator is defective Chart 3 OVCO Trip Determine 28 V or 14 V Yes No 28 V side tripped OVCO circuit Go to Chart 3b With meter red lead on 28 V B at battery and black lead on chassis ground start engine Watch meter dial Does meter read charge voltage above 29 V 14 V side tripped OVCO circuit Go to Chart 3a Figure 6 Alternator to Regulator 4 Socket Harness Plug SOCKET CONNECTIONS A F B Pha...

Page 7: ...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 service CENiehoff com ...

Search results

Summary of Contents for N1225

Reviews:

Related manuals for N1225

Brands by name

Popular brands

Cen N1225, Troubleshooting Manual

Search results

Summary of Contents for N1225

Reviews:

Related manuals for N1225

Brands by name

Popular brands