Ce-niehoff-co N1128 Troubleshooting Guides Manual de usuario descargar pdf (Pagina 8)

Page 8

TG0027A

Section 4: Advanced Troubleshooting

(CONT’D)

Yes

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 2.2 ± 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 6 – Alternator-to-Regulator 4-Socket Harness Plug

SOCKET

CONNECTIONS

AF–

B Phase Signal AC

CB–

D 28 V B+

Yes

Original regulator

is defective.

Replace regulator with known good regulator.

Run engine. Does OVCO trip?

Alternator

is defective.

Yes

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)?

If you have questions about your alternator or any of these test procedures, or if you need to locate a Factory Authorized Service Distributor, please contact us at:

C. E. Niehoff & Co.• 2021 Lee Street • Evanston, IL 60202 USA

TEL: 800.643.4633 USA and Canada • TEL: 847.866.6030 outside USA and Canada • FAX: 847.492.1242

E-mail us at support@ceniehoff.com

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