C.E. Niehoff & Co. C619/C630/N1222/N1223/A1-607/A1-608 Troubleshooting Guides User Manual
Page 5
Page 5
TG8B
Section C: Advanced Troubleshooting
(CONT’D)
Test for battery voltage at B+ terminal on alternator to ground, then at F+ terminal on alternator to
ground. Does battery voltage exist?
Yes
No
Repair vehicle wiring as necessary. Continue test.
Vehicle charging circuit test is complete.
Remove jumper wire. Run engine and
re-test charging circuit for operation.
Chart 2 – No Alternator Output –
Energize Switch – Test Charging Circuit
Jumper B+ terminal on alternator to E or IGN
terminal on alternator. Touch shaft with steel tool to
detect significant magnetism. Is shaft magnetized?
Yes
No
Go to energize switch on engine in energize circuit.
Test for battery voltage going into energize switch
from battery. Does battery voltage exist?
Yes
No
Make sure jumper wire from alternator B+ termi-
nal to alternator E or IGN terminal is still attached.
Test for battery voltage at energize switch E termi-
nal connection. Does battery voltage exist
at energize switch?
Energize circuit from
alternator to energize
switch is good. Energize
switch is defective.
STATIC TEST – ENGINE OFF, BATTERY SWITCH ON, KEY ON
Repair vehicle circuit to
energize switch. Continue test.
Yes
No
Repair vehicle circuit
from E or IGN teminal
on alternator to ener-
gize switch on engine.
Figure 3 – 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, con-
nect jumper wire from socket C on the harness
to ground). Spark will occur at ground. Touch
steel tool to shaft to detect significant magne-
tism. Is shaft magnetized?
Disconnect Regulator Bypass Adapter or jumper wire.
Connect DMM red lead to socket E in alternator-to-regula-
tor plug. Connect black lead to socket A in same plug.
Does battery voltage exist?
Regulator is
defective.
Yes
No
Check wiring and connections to
alternator.
Run engine and re-test charging
circuit for operation.
Yes
No
Alternator
is defective.