Ce-niehoff-co N1225-1/N1237-1/N1505-1 Troubleshooting Guides Manual de usuario descargar pdf (Pagina 6)

Page 6

TG0017B

(CONT’D)

Section 3: Advanced Troubleshooting

Yes

Alternator is defective.

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

plug. Connect black lead to pin D in plug. Does resistance read 1.8 ± 2.2 ohms?

Chart 3b – No 28 V Alternator Output – Test OVCO Circuit

Yes

Replace existing regulator with known good regulator.

Run engine. Does OVCO trip?

Alternator is defective.

Original regulator is

defective.



Chart 3a – No 14 V Alternator Output – Test OVCO Circuit

Yes

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

resistance read OL (out of limits)?

Alternator is defective.



Chart 3 – OVCO Trip – Determine 28 V or 14 V

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 6 – Alternator-to-Regulator 4-Socket Harness Plug

SOCKET CONNECTIONS

A F–

B Phase Signal AC

C B–

D 28 V B+

Yes

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



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