Ce-niehoff-co C702D Troubleshooting Guides Instrukcja Użytkownika Pobierz pdf (Strona 5)

Page 5

TG65A

Section C: Advanced Troubleshooting (CONT’D)

Figure 3 – Alternator-to-Regulator Harness Plug

Chart 1 – No Alternator Output

With engine running, does battery voltage exist at alternator B+ terminal and regulator IGN terminal?

Yes

Repair vehicle harness circuit to IGN terminal on regulator

or B+ terminal on alternator.



With key off, engine off: Unplug alternator-to-regulator harness. Connect DMM on DC volt

scale across pins C and D in harness plug. Does battery voltage exist?

Yes



Alternator is defective.

With DMM on resistance scale, ensure that the field resistance measured between pins F and C in

harness plug is about 1.3 (±0.2) ohms.

Yes

Alternator is defective.



Install a jumper from pin F in harness plug to B+ terminal on alternator. Touch shaft with steel tool to

detect significant magnetism. Is shaft magnetized?

Yes



Alternator is defective.

CONNECTIONS

A B+ Sense

B AC IN 2

C B–

D B+

E AC IN 1

F F+



When conducting this step, ensure that the probes do not touch other pins, as an

arc may damage the wiring in the harness.

CAUTION

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 service@CENiehoff.com

Yes

Alternator is

defective.



Thermal switch

in control unit

is defective.

Set DMM to diode test. Connect black lead of DMM to B+ terminal on alternator. Connect

red lead to pin B on harness plug. DMM should read voltage drop. Reverse leads. DMM

should read OL.

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