C.E. Niehoff & Co. A2-349 Regulator Installation - Manual

II181B
Page 1 of 1
C326-1: A2-349 Regulator with Optional
A9-4039 Temperature-Voltage Sense Harness
or A9-4050 Temperature-Voltage/IGN/D+
Sense Harness
Installation Instructions
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
Figure 1
1. Before installing, turn regulator over and select
appropriate switch position (See NOTICE above and
Table 1 and Figure 1).
2. Mount A2-349 curved-base regulator on alternator
in the same position as the previous regulator. Use
screws and washers (if supplied). Torque regulator
mounting screws to 8.5 Nm/ 75 lb. in. See Figure 2.
3. Plug alternator-to-regulator harness securely into
5-socket connector on regulator.
4. See Figure 2:
• If not using A9-4039 or A9-4050 harness, keep
cap on regulator.
• If using A9-4039 or A9-4050 harness:
a. Remove cap from regulator and plug harness
connector into 5-pin connector.
b. Harness length varies, but is long enough to
reach battery compartment in most vehicles.
Unused harness length should be coiled up.
Use cable ties every 12-14 inches to securely
support harness between regulator and
battery. If harness length must be cut:
1) Black wire—Do not shorten unless abso-
lutely necessary. If necessary, cut off first
6 inches on terminal end and save cut piece
to reattach. Cut length off of remaining
black wire. Crimp and solder two ends and
seal with insulated butt splice.
2) Red wire—cut to desired length and use
terminal to connect.
3) Attach terminal from black wire in harness
to battery negative post and terminal from
red wire to 28V battery positive post.
A2-349 regulator can be used with or without A9-4039 or A9-4050 harness from the vehicle.
• When A9-4039 or A9-4050 harness is not connected, regulator will operate in fi xed voltage setting
determined by the select switch position on the bottom of the regulator. See column 1 in Table 1.
• When A9-4039 or A9-4050 harness is connected, regulator will automatically optimize the charge
voltage for battery type based on temperature. See column 2 in Table 1 and select switch position
based on battery type.
NOTICE
Figure 2 – A2-349 Alternator-mounted Regulator
Alternator-to-regulator
connector
See step 4
LED
c. A9-4050 harness has two additional wire connections
for regulators requiring external ignition feed or D+
voltage sense/reference signal. See Figure 2.
1) Green wire (D+)—Connect splice to vehicle voltage
sense/signal wire. If terminal is used to run relay,
the relay coil must be diode protected and rated
for proper voltage. Crimp spliced end securely.
Use heat gun to seal splice. D+ terminal provides
5 amps of 14 V or 28 V output.
2) Brown wire (IGN)—Connect splice to switched
voltage source from vehicle. Crimp end securely.
Use heat gun to seal splice.
5. Verify all electrical and mechanical connections to
regulator are tight.
Table 1 – Regulator Select Switch Position
Switch Position
Position 1 27.5 V
Position 2 28.0 V
Position 3 28.5 V
Position 4 29.0 V
Maintenance (D Category)
Maintenance-Free (Group 31)
AGM
DO NOT USE POSITION #4
A9-4039/A9-4050 Harness
Not Connected (Voltage Select)
See NOTICE above
A9-4039/A9-4050 Harness
Connected (Battery Type)
See NOTICE above