C.E. Niehoff & Co. 6-Pin Connector Extended Wiring Harness User Manual
Extended Wiring Harness with
Round 6-Pin Connectors
for Remote-Mounted Commercial Regulators
Installation Instructions
1. When required, install adapter plate CEN Part No. A9-490 at remote location as indicated by bus
manufacturer.
2. Before installing regulator, make sure setpoint switch on back of regulator is set for appropriate battery
type. See Table 1 and Figure 1. Then install regulator on adapter plate.
Table 1 – Voltage Select Switch Position
4 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).
3. Connect extended wiring harness between regulator and alternator. Make sure harness plugs are securely
connected to regulator and alternator sockets.
4. When connecting REG/IGN wire and NO-CHARGE wire from vehicle harness into mating 2-pin connector,
crimp and solder the connections and make sure pins are secured tightly in connector body.
5. Connect green wire to regulator IGN terminal and white wire to regulator D+ terminal.
6, Using cable ties every 12-14 inches, securely support wiring harness between alternator and regulator.
Mating connector included
with harness
Harness includes 20 A slow-blow fuse
(Bussman MDA20 or equiv.)
in each fuse holder
Battery Type
Maintenance
Maintenance-Free
Maintenance-Free
Battery Isolator setpoint
Figure 1 – 4 Voltage Setpoints
Step 4: Wire from REG/IGN source to pin A
in 2-pin connector
V
Step 4: Wire to NO-CHARGE input into pin B
in 2-pin connector
V
4 places—#10-32 screws
torque to 8.5 Nm/75 lb. in.
V
V
2
3
1
4 places—1/4-20 screws and
lockwashers (provided) torque
to 8.5 Nm/75 lb. in.
4
V
V
P terminal
V
W
Extended
Wiring Harness
Step 5: Green wire from
pin A (IGN source)
in 2-pin connector
to IGN terminal on regulator—
torque to 4.5 Nm/40 lb. in.
Figure 2 – Remote Mounted Commercial Regulator with Extended Alternator Wiring Harness
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
Step 5: White wire from pin B
(D+ Multiplex input)
in 2-pin connector
to D+ terminal on regulator—
torque to 4.5 Nm/40 lb. in.
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V
Diagnostic LED
II0112C
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