Ce-niehoff-co C651/C654 Troubleshooting Guides Manuel d'utilisateur télécharger pdf (Page 6)

Page 6

TG0010C

(CONT’D)

Section 3: Advanced Troubleshooting

Yes

With engine off, is battery voltage present at alternator 14 V B+ terminal?

Chart 3 – No 14 V Alternator Output – Test Circuit

Yes

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?

Alternator is defective.

Repair vehicle wiring as necessary.

Continue test.

Substitute a known good regulator. Run engine. Is regulator

setpoint voltage present?

Yes

Alternator is

defective.

Original regulator

was defective.

Figure 4 – Alternator-to-Regulator Harness Plug

PIN CONNECTIONS

Pin A F–

Pin B SCR Gate

Pin C B–

Pin D 28 V B+

Pin E 14V B+

Pin F F+

Pin G AC Signal

Pin H Not Used

1 2 3 4 5 6 7 8

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Ce-niehoff-co C651/C654 Troubleshooting Guides Manuel d'utilisateur Page 6