C.E. Niehoff & Co. N1601/N1602/N1603/N1604 Troubleshooting Guides - Manual (Page 10)

Page 10 TG29D
If you have questions about your alternator or any of these test procedures, or if you need to locate a Factory Authorized Service Dealer, 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 [email protected]
Section C: Advanced Troubleshooting
(CONT’D)
Yes No
Alternator is defective.
With engine off, unplug alternator-to-regulator harness. Connect DMM red lead to socket A on harness plug.
Connect black lead to alternator anti-drive end B+ terminal. Does resistance measure about 1.0 ± 0.2 ohms?
Chart 5 – N1604-all models – No Alternator Output – Test OVCO Circuit
Yes No
Connect DMM red lead to socket A on alternator-to-
regulator harness plug. Connect black lead to alternator
anti-drive end B– terminal. Does continuity exist?
Alternator is defective.
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Figure 10 – Alternator-to-Regulator Harness Plug
SOCKET CONNECTIONS
Pin A F–
Pin B AC Terminal
Pin C B–
Pin D B+
Yes No
Connect DMM red lead to socket A on alternator-to-regulator
harness plug. Connect black lead to alternator case.
Does continuity exist?
Regulator is defective.
Alternator is defective.
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