Ce-niehoff-co C622 Troubleshooting Guides Manuel d'utilisateur télécharger pdf (Page 5)

Page 5

TG0011A

Section 3: Advanced Troubleshooting

(CONT’D)

Yes

Alternator is defective.

Disconnect ground cable from 28 V battery pack. Unplug alternator-to-regulator harness from regulator.

Connect red lead from DMM to socket S in plug. Connect black lead to alternator 28 V B+ terminal. Does

resistance read 2.2 ± 0.2 ohms?

Chart 1 – 28 V RED LED On Steady – No Alternator Output – Test OVCO Circuit

Yes

Reconnect cables. Replace existing regulator with known good regula-

tor. 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 2 – 84 V RED LED On Steady – No Alternator Output – Test OVCO Circuit

Alternator is defective.

Make sure batteries are properly charged before proceeding.

Yes

Disconnect cable from alternator 28 V B+ terminal. Set DMM to ohms

scale. Connect red lead from DMM to socket S in plug. Connect black lead

to 28 V B– terminal. Does meter read OL (out of limits)?

Alternator is defective.

HIGH VOLTAGE . Use extreme

caution when working around 84 V

system. Severe personal injury or death will result from contact.

DANGER

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Ce-niehoff-co C622 Troubleshooting Guides Manuel d'utilisateur Page 5