Installation Manual

II70EPage 1 of 1

A2-325, A2-330 & A2-336

Regulators

C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633

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

Battery Type

Maintenance

Maintenance-Free

Note: On Group 31 batteries, if boiling or excessive gassing occurs with high voltage

setpoint (position 3), change to medium voltage setpoint (position 2).

Figure 1 – Voltage Setpoints

Installation Instructions

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.

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.