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C.E. Niehoff & Co. N1313 Troubleshooting Guides User Manual

Page 6

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Page 6

TG16F

Section C: Advanced Troubleshooting

(CONT’D)

Chart 2 – No 14 V Alternator Output – Test Circuit

Yes

No

Connect jumper from pin C on alternator-to-regulator 3-socket harness plug to 28 V B+ terminal

on alternator. Does test light glow brightly?

Alternator is defective.

Substitute a known good regulator. Run engine. Is regulator setpoint

voltage present?

Yes

No

Alternator is

defective.

Original regulator

was defective.

Before starting test:
1. Remove 14 V B+ cable at alternator. Insulate cable to prevent arcing.
2. Connect test light across 14V B+ terminal on alternator and B–terminal on alternator.

Figure 4 – Alternator-to-Regulator 3-Socket Harness Plug

SOCKET CONNECTIONS

A

14 V B+

B

unused

C

14 V Control

A

B

C