Ce-niehoff-co C701/C701A Troubleshooting Guides Manuel d'utilisateur télécharger pdf (Page 5)

Page 5

TG3E

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 sockets A and E in harness plug. Does battery voltage exist?

Yes



Alternator is defective.

With DMM on resistance scale, ensure that the field resistance measured between sockets B and C in

harness plug is about 1.2 (±0.2) ohms.

Yes

Alternator is defective.



Install a jumper from socket B in harness plug to B+ terminal on alternator. Momentarily (1 sec.) jumper

socket C in harness plug to alternator B– terminal. Touch shaft with steel tool to detect significant mag-

netism. Is shaft magnetized?

Yes

Go to Chart 3, page 7.



Regulator is defective.

SOCKET CONNECTIONS

Socket A B–

Socket B Field +

Socket C Field –

Socket D AC

Socket E B+

1 2 3 4 5 6 7 8

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Ce-niehoff-co C701/C701A Troubleshooting Guides Manuel d'utilisateur Page 5