Ce-niehoff-co N1246-1 Troubleshooting Guides Manual de usuario descargar pdf (Pagina 6)

Page 6

TG0049A

(CONT’D)

Section 3: Advanced Troubleshooting

Yes No

Alternator is defective.

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

Connect black lead to socket D in plug. Does resistance read 1.8 ± 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.

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

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 – 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 5 – Alternator-to-Regulator Harness Plug

Yes No

Original regulator

is defective.

Replace regulator with known good regulator.

Run engine. Does OVCO trip?

Alternator

is defective.

Yes

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

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

SOCKET CONNECTIONS

A ° F–

B ° AC1

C ° Not used

D ° B+

E ° P

F ° AC2

G ° B–

H ° B–

I ° AC3

Alternator is defective.

Original regulator

is defective.

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Ce-niehoff-co N1246-1 Troubleshooting Guides Manual de usuario Pagina 6

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