C.E. Niehoff & Co. A2-325, A2-330, A2-336 Regulator Installation

A2-325, A2-330 & A2-336

Regulators

Installation Instructions

Table 1 – Voltage Setpoint Switch Position

Voltage Setpoints (Fig. 1)
Position 1 27.5 V
Position 2 28.0 V
Position 3 28.5 V
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 regulator mounting screws supplied.

Torque screws to 8.5 Nm/75 lb. in.

3. Plug the alternator-to-regulator harness into

the regulator and twist connector to make sure
it is securely tightened.

Battery Type
Maintenance

Maintenance
Maintenance-Free
Maintenance-Free

4. Regulator connections:

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

• D+ terminal can provide 28 VDC sense
voltage to multiplex controller. When
required, connect D+ terminal to control­ ler 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.

• P terminal taps AC voltage, typically half
the charge voltage. When required, connect
P terminal to tachometer or relay. Torque
M6 terminal nut on regulator to 4.5 Nm/
40 lb. in.

2

3

1

Figure 1 – Voltage Setpoints

4

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

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