TG0007A
C. E. Niehoff & Co.
BRUSHLESS ALTERNATORS
Chart 3 – No Alternator Output –
Ignition Switch
Ignition Switch
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
No
Disconnect jumper. Apply 12 V test light to
regulator E terminal and ground. Does light
glow brightly?
Yes
No
Run vehicle. Does charge voltage exist?
System
operating
normally.
Repair wiring or
ignition switch.
Yes
No
Jumper B+ terminal on
alternator to regulator
E terminal. Does charge
voltage exist?
Yes
No
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
No
Repair vehicle wiring as necessary. Continue test.
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
No
Disconnect Adapter or jumper
wire. Alternator is defective.
No
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
No
Disconnect Adapter or jumper
wire. Alternator is defective.
R
Section 3: Advanced Troubleshooting
Page 6
TG7B
