C633-1 Alternator / A2-355 Regulator
OEM Wiring Connections
Dual or Single Voltage
Installation Instructions
DUAL VOLTAGE (28 V/14 V) applications
(see other side for single voltage):
1. Connect as shown on this page.
Regulator receptacle
Regulator – “AC” Terminal
Washer
Locknut, #10-24;
torque to 3.4 Nm / 30 lb.in.
Vehicle harness
Figure 1a – A2-335 Regulator Dual Voltage Wiring Connections
Phase
connector cap
A2-355 Regulator
Vehicle harness
(to +14V battery)
Regulator –
“+14V”
terminal
Nut, 5/16-18 UNC-2B;
torque to 5.6 Nm / 50 lb.in.
Washer
Regulator – “IGN” Terminal
Washer
Nut, 1/4-20; torque to
3.4 Nm / 30 lb.in.
C633-1
Alternator
+28 V B+ Bolt
on alternator
.3750-16 UNC-2B;
torque to
15 Nm / 11 lb.ft.
Lock Washer
Washer
Vehicle “B+” lead
Figure 1b – Positive Terminal Connections
Ground Bolt
on alternator
.3125-18 UNC-2A;
torque to 9 Nm / 80 lb.in.
Terminal on
vehicle ground lead
Lock Washer
Washer
Terminal on
II185B
Figure 1c – Ground Terminal Connections
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SINGLE VOLTAGE (28 V) applications (see other side for dual voltage):
1. Connect as shown on this page.
Phase
connector cap
Regulator – “+14V”terminal
(unused for 28V only)
Nut, 5/16-18 UNC-2B;
A2-355 Regulator
torque to 5.6 Nm / 50 lb.in.
Regulator connector
Regulator – “AC” Terminal
Washer
Locknut, #10-24; torque to 3.4 Nm / 30 lb.in.
Vehicle harness
Figure 2 – A2-355 Regulator Single Voltage Wiring Connections
Washer
Regulator – “IGN” Terminal
Washer
Nut, 1/4-20; torque to
3.4 Nm / 30 lb.in.
+28 V B+ Bolt
on alternator
.3750-16 UNC-2B;
torque to
15 Nm / 11 lb.ft.
Lock Washer
Washer
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C633-1
Alternator
Vehicle “B+” lead
Figure 2b – Positive Terminal Connections
Ground Bolt
on alternator
.3125-18 UNC-2A;
torque to 9 Nm / 80 lb.in.
Terminal on
vehicle ground lead
Lock Washer
Washer
Figure 2c – Ground Terminal Connections
Terminal on
II185B
Please reference the following documents:
• Alternator troubleshooting guides by
alternator model at www.CENiehoff.com
• Maintenance interval information at
www.CENiehoff.com:
SB0015—Bus Vehicles
SB0014—Mining Vehicles
SB0012—Fire and EMS Vehicles
• CEN 633 Series Alternator Service Manual
SM38 from the address listed below.
• To order genuine CEN service parts or to
locate a Factory Authorized Service Dealer,
please contact:
C.E. Niehoff & Co.
2021 Lee Street • Evanston, IL 60202 USA
II185B
TEL: 800.643.4633 USA and Canada •
TEL: 847.866.6030 outside USA and Canada •
FAX: 847.492.1242 •
E-mail us:
Visit our Web site:
sales@CENiehoff.com
www.CENiehoff.com
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