C.E. Niehoff & Co. C520, A2-326 Installation

A9-4000 & A9-4001 Extended Wiring Harnesses

for Remote-Mounted A2-326 Regulator

with C520 Alternator

Installation Instructions

1. Before installing regulator, make sure battery-age switch
on back of regulator is set for appropriate battery age
in years. See Table 1 and Figure 1. Then install regulator
in location determined by vehicle manufacturer.

2. Connect 20-ft. A9-4000 extended wiring harness between
regulator and alternator. Make sure harness plugs are
securely connected to regulator and alternator sockets.
See Figure 2.

3. Using cable ties every 12-14 inches, securely support wiring

Table 1 — Battery-Age

Setpoints on Regulator

Setpoint Battery Age (Years)

1 New

2 1

3 2

4 3+

harness between alternator and regulator.

4. Connect A9-4001 battery sense harness to J1939 connector on regulator.

5. Complete remaining connections from battery sense harness as shown in Figure 2.

C520 Alternator

A9-4000 Extended wiring harness

A2-326 Regulator

2

3

1

4

Figure 1 –

4 Battery-Age

Setpoints

J1939/11 Connector

A9-4001 Battery sense harness

Battery current sensor: current sensor
can be placed on positive or negative
battery cable but battery CHARGING
current should fl ow in direction shown

Fuseholder w/1 amp
fuse included

Black wire

Red wire

Connect to battery negative post or busbar
(3/8 dia)

Connect to battery positive post or
busbar (3/8 dia)

Figure 2 – Remote-Mounted A2-326 Regulator/C520 Alternator with Extended Wiring Harnesses

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

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