Ce-niehoff-co N1224 Standard Troubleshooting Guides Manual do Utilizador descarregar pdf (Página 7)

Page 7

TG0045A

Section 5: Advanced Troubleshooting (CONT’D)

Yes

Alternator is defective.

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

nect black lead to pin C in plug. Does resistance read 1.5 ± 0.2 ohms?

Chart 3 – 28 V LED Steady RED– No Alternator Output – Test OVCO Circuit

Yes

Reconnect cables. 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 4 – 14 V LED Steady RED– No Alternator Output – Test OVCO Circuit

Alternator is defective.

Remove 28 V and 14 V positive battery cables AT BATTERY PACK before proceeding.

Yes

Go to Chart 3.

Run engine. Is 28 V LED on regulator flashing GREEN?

Yes

With engine off, is battery voltage present at alternator 14 V B+ terminal?

Chart 2 – 14 V LED Flashing AMBER – No 14 V Alternator Output – Test Circuit

Yes

Connect DMM red lead to pin E on alternator-to-regulator harness plug.

Connect black lead to pin C on same plug. Does battery voltage exist?

Alternator is defective.

Repair vehicle wiring

as necessary. Continue test.

Substitute a known good regulator. Run engine. Is regulator setpoint voltage present and is 14 V LED flashing GREEN?

Yes

Original regulator was defective.

Yes

Go to Chart 1.

Run engine. Is 28 V LED on regulator flashing GREEN?

Alternator is defective.

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Ce-niehoff-co N1224 Standard Troubleshooting Guides Manual do Utilizador Página 7