C.E. Niehoff & Co. N3247 Installation

28/14 V and 28 V Applications

N3247 Regulator in 28/14 V applications:

N3247 Regulator

Installation Instructions

Connect as shown in Figure 1.

Boots (2)

(see Figure 2 for 28 V)

Locknut, #10-24;

torque to 2.3 Nm / 20 lb.in.

Washer

Regulator - AC terminal

2 places: #10-32 screw, lock washer, and washer;

torque to 3.4 Nm / 30 lb.in.

Boot

Vehicle

harness

Washer

Nut, 0.312-18 UNC-2B;

torque to 5.6 Nm / 50 lb.in.

FIGURE 1 – Installing N3247 in 28/14 V Applications

N3247 Regulator in 28V applications:

Locknut, 0.250-20;

torque to 4 Nm / 35 lb.in.

Washer

Regulator - IGN terminal

Alternator connector

J1939 connector

0.250-28 screw and washer;
torque to 8.5 Nm / 75 lb.in.

AC connector

Regulator - 14 V terminal

Connect as shown in Figure 2.

Boots (2)

(see Figure 1 for 28/14 V)

Locknut, #10-24;

torque to 2.3 Nm / 20 lb.in.

Washer

Regulator - AC terminal

2 places: #10-32 screw, lock washer, and washer;

torque to 3.4 Nm / 30 lb.in.

Washer

Nut, 0.312-18 UNC-2B;

torque to 5.6 Nm / 50 lb.in.

Locknut, 0.250-20;
torque to 4 Nm / 35 lb.in.

Washer

Regulator - IGN terminal

Alternator connector

J1939 connector

0.250-28 screw and washer;
torque to 8.5 Nm / 75 lb.in.

AC connector

Regulator - 14 V terminal

—NOT USED in

28V applications

FIGURE 2 – Installing N3247 in 28 V Applications

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

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