C.E. Niehoff & Co. C711/C712 Troubleshooting Guides User Manual

Page 6

Page 6

TG0009A

C. E. Niehoff & Co.

BRUSHLESS ALTERNATORS

Section 3: Advanced Troubleshooting

(CONTD)

Chart 3 – No Alternator Output – Ignition Switch

Ignition Switch

Ignition Switch – Test Charging Circuit

Jumper B+ terminal on alternator to E terminal
on alternator. Touch shaft with steel tool to de-
tect significant magnetism. Is shaft magnetized?

Yes

Disconnect jumper. Apply 12 V test light to
alternator E terminal and ground. Does light
glow brightly?

Yes

Run vehicle. Does charge voltage exist?

System
operating
normally.

Repair wiring or
ignition switch.

Yes

Jumper B+ terminal on
alternator to E terminal
on alternator. Does charge
voltage exist?

Yes

Repair wiring
or ignition
switch.

Contact CEN
Service
Department
for assistance.

Test for battery voltage at B+ terminal on alternator to ground, then at F+ terminal on regula-
tor to ground. Does battery voltage exist?

Yes

Repair vehicle wiring as necessary. Continue test.

STATIC TEST ENGINE OFF, BATTERY SWITCH ON, KEY ON

Figure 4 Alternator-to-Regulator Harness Plug

SOCKET CONNECTIONS

Socket A B

Socket B Energize

Socket C Field

Socket D Not Used

Socket E B+

Unplug alternator-to-regulator harness. Plug
CEN Regulator Bypass Adapter A10-129 into
harness plug and touch black lead to ground
on alternator case. (If no Adapter is available,
connect jumper wire from socket C on the
harness to ground). Spark will occur at
ground. Touch steel tool to shaft to detect
significant magnetism. Is shaft magnetized?

Disconnect Regulator Bypass Adapter or jumper wire.
Connect DMM red lead to socket E in alternator-to-
regulator plug. Connect black lead to socket A in same
plug. Does battery voltage exist?

Regulator is
defective.

Yes

Check wiring and connections to
alternator.

Run engine and re-test charging
circuit for operation.

Yes

Alternator
is defective.