C653 and C653A Alternators
Installation Instructions
This symbol is used to indicate
CAUTION
presence of hazards that can cause
minor property damage.
1. Install alternator as shown in Figure 1:
Slip bushing located in rear
mounting foot must be securely
tightened against alternator
mounting bracket on engine.
Failure to do so can result in
broken mounting feet or broken
upper mounting bracket.
a. Use hardened washers between aluminum
b. OEM units are shipped with pulley, hardened
c. Aftermarket units are shipped with shaft collar,
d. Follow vehicle manufacturer’s recommendations
2. All cabling, wiring or conduit must be supported
3. Choose wire gauge capable of handling maximum
4. Regulator is furnished with OEM units and is sup-
Slip bushing must be tightened against
bracket — see “CAUTION” above
CAUTION
surfaces and bolt heads and nuts.
washer and locknut installed.
disk spring washer, and nut. Remove and
discard shaft collar. Install pulley and furnished
disc spring washer. Torque nut to 163 Nm/
120 lb. ft.
for belt tension.
within 305 mm/12 in. of termination on alternator.
alternator output with no more than 0.4 V drop on
each leg from alternator to battery.
plied separately by request with aftermarket units.
Mounting screws on regulator should be torqued to
8.5 Nm/75 lb. in. If regulator is to be remote-mounted, see separate instructions packed with extended
wiring harness. A2-338 regulator: See page 2 for
regulator mounting instructions.
5. Make electrical connections to CEN regulator as
required, using proper ring terminals (follow vehicle
manufacturer’s diagram and separate instructions
packed with extended wiring harness when used):
a. Make sure alternator-to-regulator harness is
plugged securely in regulator receptacle.
b. A2-146/A2-153 regulators have P terminal with
M6 stud and D+ terminal with M5 stud. Torque
terminal nuts to 4.5 Nm/40 lb. in.
• P terminal taps AC voltage, typically half the
charge voltage.
• D+ terminal provides 28 VDC voltage output
to multiplex controller. When connecting D+
terminal to controller through a relay, the
relay coil must be diode protected and rated
for proper voltage.
c. A2-214 regulator has P and D+ terminals with
M6 studs and an IGN terminal with an M5 stud.
Torque terminal nuts to 4.5 Nm/ 40 lb. in.
• P terminal taps AC voltage, typically half the
charge voltage.
• Optional D+ terminal provides 28 VDC
voltage output to multiplex controller. When
connecting D+ terminal to controller
through a relay, the relay coil must be diode
protected and rated for proper voltage.
d. A2-338 regulator: See page 2 for regulator
electrical connections.
M12x1.75 bolt–torque to 61 Nm/45 lb. ft.
Battery output
cable terminal
Alternator B+ Terminal Stud
Lockwasher
Washer
Insulator
C653
ADE View
12mm/0.50 Locknut –
88 Nm/65 lb. ft.
Page 1 of 2
Hardened washer
torque to
Bracket
on engine
M10 locknut –
torque to 15 Nm/11 lb. ft.
Figure 1 - C653 Alternator Installation Details
B– terminal
C653A
ADE View
II25E
A2-338 Regulator Installation on C653 and Electrical Connection:
1. Install regulator on C653 alternator, using mounting hardware furnished with regulator. Torque
screws to 8.5 Nm/75 lb. in.
2. Plug alternator-to-regulator harness securely into
regulator.
3. If A9-4011 temperature sense lead is used, see
Figure 2:
a) Connect twin lead ends of A9-4011 tempera ture sense lead:
• one to regulator T terminal, using hard ware furnished, torque terminal nut to
4.5 Nm/40 lb. in.
• the other to one mounting bolt. Retorque
to 8.5 Nm/75 lb. in.
b) Connect single sense lead ring terminal to
B– terminal on battery as shown in Figure 2.
Tighten hardware securely.
c) Coil up any unused sense lead and use cable
ties every 12-14 inches to securely support
temperature sense lead between regulator
and battery.
T terminal – torque M6 nut
to 4.5 Nm/40 lb. in.
4. Complete remaining connections to regulator, if
required, as shown in Figure 2.
• Connect P terminal to tachometer or relay.
P terminal taps AC voltage, typically half the
charge voltage. Torque M6 terminal nut on
regulator to 4.5 Nm/ 40 lb. in.
• Connect D+ terminal to multiplex controller:
D+ terminal provides 28 VDC voltage output
to multiplex controller. When connecting D+
terminal to controller through a relay, the
relay coil must be diode protected and rated
for proper voltage. Torque M5 terminal nut on
regulator to 4.5 Nm/40 lb. in.
5. When the A9-4011 temperature sense lead is not
in use, the regulator will operate at 27.5 V.
6. When A9-4011 temperature sense lead is in use,
the lead senses the ambient temperature within
the battery box and regulator will adjust charge
voltage based on battery temperature—the higher
the battery temperature, the lower the charge
voltage.
P terminal – torque M6 nut to 4.5 Nm/40 lb. in.
D+ terminal – torque M5 nut to 4.5 Nm/40 lb. in.
A9-4011 Temperature sense lead
Connect to B– terminal on battery
Figure 2 – A2-338 Regulator on C653 Alternator with Temperature Sense Lead
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
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II25E