C.E. Niehoff & Co. C715/C716 Troubleshooting Guides User Manual

Page 6

Page 6

TG0007A

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 regulator. Touch shaft with steel tool to detect
significant magnetism. Is shaft magnetized?

Yes

Disconnect jumper. Apply 12 V test light to
regulator 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 regulator
E terminal. 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 Field +

Socket C Field

Socket D Phase (R)

Socket E B+

Yes

Unplug alternator-to-regulator harness. Plug CEN
Regulator Bypass Adapter A10-129 into harness
plug. Make sure black lead does not touch
ground. Clip red lead to B+ terminal on alternator.
(If Adapter is not available, connect jumper wire
from socket B on harness to alternator B+ termi-
nal.) Does spark occur at alternator B+ terminal?

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

Regulator is defective.

Yes

Disconnect Adapter or jumper
wire. Alternator is defective.

Alternator is defective.

Touch black lead to ground on alternator case.
(If Adapter is not available, connect jumper wire
from socket C on harness to ground.) Spark will
occur at ground. Touch steel tool to shaft to
detect significant magnetism. Is shaft magne-
tized?

Yes

Disconnect Adapter or jumper
wire. Alternator is defective.