C.E. Niehoff & Co. C802/C802D/C820 Troubleshooting Guides - Manual (Page 10)

Page 10
TG0004E
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: [email protected] OR Visit our Web site: www.CENiehoff.com
Yes No
With engine off, is battery voltage present at alternator 14 V B+ terminal?
Chart 5 – A2-303 Regulator – No 14 V Alternator Output – Test Circuit
Yes No
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? See Figure 9, page 9.
Alternator is defective.
T
Repair vehicle wiring as necessary.
Continue test.
T
T
T
Substitute a known good regulator. Run engine. Is regulator setpoint voltage present?
Yes No
Original regulator was defective.
T
Alternator is defective.
T T
(CONT’D)
Section 3: Advanced Troubleshooting