C.E. Niehoff & Co. A2-337 Regulator Installation - Manual

II157A
Page 1 of 1
A2-337 Regulator
with A9-4011 Temperature Sense Lead
for C626 Alternator
Installation Instructions
1. Install regulator on 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 1:
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 1.
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.
4. Complete remaining connections to regulator, if
required, as shown in Figure 1.
• 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.
Figure 1 – A2-337 Regulator on C626 Alternator with Temperature Sense Lead
Connect to B– terminal on battery
A9-4011 Temperature
sense lead
D+ terminal – torque M5 nut to 4.5 Nm/40 lb. in.
P terminal – torque M6 nut
to 4.5 Nm/40 lb. in.
T terminal – torque M6 nut
to 4.5 Nm/40 lb. in.
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633