Ce-niehoff-co N1387-1/EPM Troubleshooting Guides Manual de usuario descargar pdf (Pagina 9)

Page 9

TG0019A

(CONT’D)

Section 5: Advanced Troubleshooting

Ye s

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 2.0 ± 0.2 ohms?

Chart 4 – 28 V LED Flashing AMBER/ 14V LED Off – No Alternator Output – Test OVCO Circuit

Ye s

Replace existing regulator with known good regulator.

Run engine. Does OVCO trip?

Alternator is defective.

Original regulator

is defective.

Chart 3 – 14 V LED Flashing AMBER/ 28V LED Off – No Alternator Output – Test OVCO Circuit

Ye s

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.

Figure 8 – Alternator-to-Regulator 4-Socket Harness Plug

SOCKET

CONNECTIONS

AF–

B Phase Signal AC

CB–

D 28 V B+

Ye s

Original regulator

is defective.

Replace regulator with known good regulator.

Run engine. Does OVCO trip?

Alternator

is defective.

Ye s

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)?

CAUTION

Troubleshooting sequences must be performed during 3-minute delay after push-button switch on vehicle is

pressed. If main LED on EPM is not flashing GREEN, press switch to reactivate system. LED on EPM must be

flashing GREEN while performing tests.

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Ce-niehoff-co N1387-1/EPM Troubleshooting Guides Manual de usuario Pagina 9