C.E. Niehoff & Co. C722 & C724 Troubleshooting Guides - Manual (Page 2)

Page 2 TG71A
Section A: Wiring Diagrams
Figure 2 — C722 Alternator Terminals
CEN C722 Alternator
Description and Operation
C722 28 V (350 A) alternators are self-rectifying. All
windings and current-transmitting components are
non-moving, so there are no brushes or slip rings to
wear out. These alternators become externally energized
through the E terminal, connected to a switched power
source to turn on regulator.
Features of
A2-212 regulator furnished with some C722
units include:
• R (or W) terminal with voltage limiter
that limits output voltage to
8V peak. Output voltage
frequency (Hz) =
alternator rpm/10.
• D+ terminal to provide signal
to vehicle electrical system,
confirming alternator
operation.
• overvoltage cutout (OVCO).
See page 4.
C722 ADE View
B– bolt terminal

D+ terminal
E terminal


B+ bolt terminal


R (or W)
terminal
CEN C724 Alternator
Description and Operation
C724 28 V (350 A) alternators are
self-rectifying. All windings and
current-transmitting components are
non-moving, so there are no brushes
or slip rings to wear out. These
alternators become externally
energized through the IGN terminal,
connected to a switched power source
to turn on regulator.
Figure 1 — C722 and C724 Wiring Diagrams
REGULATOR
RECEPTACLE
B+
Bñ
D+
R
E
RECTIFIER
DUAL
DIODE TRIO
FIELD
A2-212
REGULATOR
ALTERNATOR
LOAD
BA
TTER
Y
STATOR
STATOR
IGNITION
SWITCH
E
F
D
C
B
A
CHARGE
WARNING
LIGHT OR
CONTROLLER
THERMAL
SWITCH
W
BR
R
BK
G
R
*
*Thermal switch is not factory-
installed on all models.
IGN
P
B–
Figure 3 — C724 Alternator Terminals
C724 ADE View
B– bolt terminal

D+ terminal
P terminal


B+ bolt terminal

IGN terminal

Features of A2-214 regulator furnished with some C724
units include:
• P terminal that can provide
optional AC voltage tap.
• D+ terminal that can provide DC voltage signal to
vehicle electrical system, confirming alternator
operation.
• Overvoltage cutout (OVCO). See page 4.
• Green lens LED. See page 4.