C.E. Niehoff & Co. A2-213, A2-214 Regulator Installation

A2-213 and A2-214

Regulators

Installation Instructions

Table 1 – Voltage Select Switch Position

4 Voltage Setpoints (Fig. 1)
Position 1 27.5 V
Position 2 28.0 V
Position 3 28.5 V

Maintenance (D Category)
Maintenance-Free (Group 31)
Maintenance-Free (Group 31)

Position 4 29.0 V

Note: On Group 31 batteries, if boiling or excessive gassing occurs with high voltage
setpoint (position 3), change to medium voltage setpoint (position 2).

1. Before installing, turn regulator over and select
appropriate voltage setpoint for battery type
(See Table 1 and Fig. 1).

2. Install new regulator as described below:

a. Mount new regulator on alternator in the same

position as the previous regulator.

b. Use screws and washers (if supplied),

2 or 4 depending on number of original
mounting holes in alternator. Torque regulator

mounting screws to 8.5 Nm/75 lb. in.

3. Plug the alternator-to-regulator harness into the
regulator.

4. A2-214 regulator connections:

• Connect IGN terminal to ignition source
through existing switch. Torque M5 terminal
nut on regulator to 4.5 Nm/40 lb. in.

• D+ terminal provides 28 VDC sense voltage
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 M6 terminal nut
on regulator to 4.5 Nm/40 lb. in.

• 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.

NOTE: If you are replacing an A2-211 regula-

tor with an A2-214 regulator, the existing R
terminal lead should now be connected to
the P terminal on the new A2-214 regulator.
See step above for details.

Battery Type

Battery Isolator setpoint

5. A2-213 regulator connections:

• Connect IGN terminal to ignition source
through existing switch. Torque M5 terminal
nut on regulator to 4.5 Nm/40 lb. in.

• D+ terminal provides 28 VDC sense voltage
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 M6 terminal nut
on regulator to 4.5 Nm/40 lb. in.

• 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.

Note: If you are replacing an A2-205 regulator with

an A2-213 regulator, make sure you connect the
existing R terminal lead to the P terminal on the
A2-213. The remaining D+ terminal on the A2-213
will not have a connecting cable.

If you are replacing an A2-207 regulator with an

A2-213 regulator, make sure your connect the
existing D+ terminal lead to the D+ terminal on
the A2-213. The remaining P terminal on the
A2-213 will not have a connecting cable.

6. LED operation modes:

• Green lens LED will light STEADY when
regulator is energized and functioning properly.

• Green lens LED will FLASH once every five
seconds when regulator is energized and engine
is not running.

• Green lens LED will not be lit when regulator
is not energized.

2

3

1

4

Figure 1 – 4 Voltage Setpoints

C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline [phone]

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