C.E. Niehoff & Co. C619/C630/N1222/N1223/A1-607/A1-608 Troubleshooting Guides - Manual (Page 2)

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Section A: Wiring Diagrams
Figure 2 — Alternator Wiring Diagram
CEN C630/C619/N1222/N1223/A1-607/A1-608
Alternators Description and Operation
The C630 alternator (14 V, 350 A), C619 alternator
(14 V, 340 A), N1222/A1-608 alternators (14 V, 290 A)
and N1223/A1-607 alternators (14 V, 250 A) are inter-
nally rectified. All windings and current-transmitting
components are non-moving, so there are no brushes or
slip rings to wear out. This unit is externally energized
through either an ignition switch or an energize switch
(commonly an oil pressure switch), which activates regu-
lator. Field coil is then energized. Regulator maintains
alternator output voltage at regulated setting as vehicle
electrical loads are switched on and off. Alternator out-
put current is self-limiting and will not exceed rated
capacity of alternator.
A2-121 regulator used with all units has a 15.5 V regula-
tor setpoint available for battery isolator applications.
Electromagnetic interference (EMI) is suppressed with
internal filters to acceptable levels defined by the Society
of Automotive Engineers (SAE) specification J1113/41.
A2-121 regulator will not reduce EMI from sources such
as antennas, poor cable routing practice, or other elec-
tronic devices that cause EMI. If EMI continues, consult
an electromagnetic compliance (EMC) specialist to
determine EMI source.
Figure 1 — Alternator with A2-121 Regulator
B– Terminal
B+ Terminal 

B+
F+
E
P1
P2
P3
B–
ALTERNATOR
RECTIFIER
FIELD
REGULATOR
LOAD BA
TTER
Y
STATOR
STATOR
ENERGIZE
SWITCH
E
C
B
A
BR
R
G
W

P1 P2 P3 E or IGN
F+ Terminal
or IGN