C.E. Niehoff & Co. N3237 Installation

N3237

Regulator

Installation Instructions

Table 1 – Voltage Select Switch Position

4 Voltage Setpoints (Fig. 1)

Position 1
Position 2
Position 3
Position 4

Regulator-to-alternator harness receptacle

LED

Vehicle interface receptacle

IGN terminal

Washer

M6 Locknut –
torque to

3.4 Nm/30 lb.in.

Customer Battery Requirements

Hawker Only (Factory Setting)

6TMF Only

Hawker & 6TMF

Other Type Battery

2

3

1

4

Figure 1 – Battery Selection

Regulator-to-alternator harness receptacle
(not functional in this model)

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

2. Install regulator as described
in Figure 2.

3. Plug both alternator-to-regula­tor harnesses into the regulator.

4. If vehicle interface receptacle is
unused it must be sealed with
MS3181-12 connector cover or
equivalent.

AC terminal

Washer

M5 Locknut – torque to 3.4 Nm/30 lb.in.

2 Places:
#10-32 UNF-2A Screw,

Lockwasher,
Washer —
torque to 3.4Nm/30 lb. in.

Spacer

5. LED:

• flash RED when voltage is 2V
above setpoint

• flash AMBER when voltage is
2V below setpoint or shaft not
rotating

• flash GREEN when voltage
within 2V of setpoint

• steady RED when regulator
shuts down due to sustained
high voltage

1/4-28 UNF-2A Screw—
torque to 8.5Nm/75 lb. in.

Figure 2 – N3237 Regulator

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

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