Ce-niehoff-co C709/C725 Troubleshooting Guides Manual de usuario descargar pdf (Pagina 7)

Page 7

TG64B

Section C: Advanced Troubleshooting (CONT’D)

Yes

Alternator is defective.

Unplug alternator-to-regulator 5-pin harness from regulator. Connect red lead from DMM to pin A in plug. Connect

black lead to pin D in plug. Does resistance read 1.0 ± 0.2 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.



Yes

Original regulator

is defective.

Replace regulator with known good regulator. Run

engine. Does OVCO trip?

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

Alternator is defective.



Yes

Set DMM to auto-ranging scale. Connect red lead from DMM to pin A in plug. Connect black lead

to B– terminal. Does resistance read OL (out of limits)? Then connect red lead to pin D and black lead

to B– terminal. Does resistance read OL (out of limits)?

Alternator is defective.



Yes

Alternator is defective.

Disconnect alternator-to-regulator 3-pin 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)?



Figure 5 – Alternator-to-Regulator 3-Pin Harness Receptacle

PIN CONNECTIONS

A 14 V B+

B unused

C 14 V Control

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 battery charge above 29 V?



14 V side tripped OVCO circuit.

Go to Chart 3a.



Figure 6 – Alternator-to-Regulator 5-Pin Harness Plug

PIN CONNECTIONS

A F–

B unused

C B–

D 28 V B+

E Phase



1 2 3 4 5 6 7 8

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Ce-niehoff-co C709/C725 Troubleshooting Guides Manual de usuario Pagina 7

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