Ce-niehoff-co N1601/N1602/N1603/N1604 Troubleshooting Guides Manual de usuario descargar pdf (Pagina 8)

Page 8

TG29D

Section C: Advanced Troubleshooting (CONT’D)

Yes

Alternator is defective.

Unplug alternator-to-regulator 4-socket harness from regulator. Connect red lead from DMM to socket A in plug.

Connect black lead to socket D in plug. Does resistance read 1.0 ± 0.2 ohms?

Chart 3b – N3107, N3118, N3211, N3223, N3237, N3245 – No 28 V Alternator Output – Test OVCO Circuit

(28V LED on N3223 steady RED)

Yes

Replace existing regulator with known good regulator.

Run engine. Does OVCO trip?

Alternator is defective.

Original regulator is

defective.



Chart 3a – N3118, N3223 – No 14 V Alternator Output – Test OVCO Circuit (14 V LED on N3223 steady RED)

Yes

With red lead from DMM connected to socket A in plug, connect black lead to B– terminal.

Does resistance read OL (out of limits)?

Alternator is defective.



Chart 3 – N3107, N3118, N3211, N3223, N3237, N3245 – OVCO Trip – Determine 28 V or 14 V

(LEDs on N3223 will determine affected output)

Yes

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 8 – Alternator-to-Regulator 4-Socket

Harness Plug

SOCKET CONNECTIONS

A F–

B Phase Signal AC

C B–

D 28 V B+

Yes No

Original regulator

is defective.

Replace regulator with known good regulator. Run

engine. Does OVCO trip?

Alternator is

defective.



Yes

Alternator is defective.

Unplug alternator-to-regulator 4-socket harness from regulator. At receptacle on regulator, connect red lead from

DMM to socket C. Connect black lead to B– terminal. Does resistance read OL (out of limits)?



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