C.E. Niehoff & Co. A9-4036 Installation

A9-4036 Temperature-Voltage Sense/J1939

Harness

Installation Instructions

FOR PARALLEL OPERATION, SEE SEPARATE INSTRUCTIONS PACKED WITH SPECIAL WIRING HARNESS

A9-4036 temperature-voltage sense/J1939 harness can be used with A2-341, A2-342, A2-343,

NOTICE

A2-346, and A2-351 regulators.

• When A9-4036 temperature-voltage sense/J1939 harness is not connected, regulator will operate
in fixed voltage setting determined by the select switch position on the bottom of the regulator.
See separate instructions with regulator.

• When A9-4036 temperature-voltage sense/J1 939 harness is connected, regulator will automatically
optimize the charge voltage for battery type based on temperature. See column 2 in Table 1 and
select switch position based on battery type.

1. Remove hardware from regulator, turn regulator over
and select appropriate switch position (See NOTICE
above and Table 1 and Figure 1).

2. Reinstall regulator on alternator. Use screws and
washers (if supplied). On alternator, torque regulator
mounting screws to 8.5 Nm/75 lb. in. Make sure
6-socket harness is securely connected to regulator.

3. Install A9-4036 temperature-voltage sense/J1939
harness to regulator:
a. Remove cap from regulator and plug harness
connector into 10-pin connector.
b. Harness length is 182 inches, enough to reach
battery compartment in most vehicles. Unused
harness length should be coiled up. Use cable ties
every 12-14 inches to securely support harness
between regulator and battery compartment. If
harness length must be shortened:

1) Black wire—Do not shorten unless absolutely
necessary. If necessary, cut off first 6 inches on
terminal end and save cut piece to reattach.
Cut length off of remaining black wire.
Crimp and solder two ends and seal with
insulatable butt splice.

2) Red wire—cut to desired length and use
terminal to connect.

c. Attach terminal from black wire in A9-4036
harness to battery negative post and terminal
from red wire to 28 V battery positive post.

If using J1939 connector on harness, connect

d.

as indicated by vehicle manufacturer.

4. Verify all electrical and mechanical connections to
regulator are tight.

Table 1 – Regulator Select Switch Position

A9-4036 Harness Connected

Switch Position

(see Figure 1)

Position 1

Position 2
Position 3
Position 4

Maintenance-Free (Group 31)

1

(Battery Type)

See NOTICE above

Maintenance (D Category)

AGM

DO NOT USE POSITION #4

2

3

4

Figure 1 — Regulator Select Switch

See step 3a

Red wire — See step 3 b & c

Black wire — See step 3 b & c
DO NOT SHORTEN UNLESS
ABSOLUTELY NECESSARY

See step 3d

Figure 2 – A9-4036 Temperature-Voltage Sense/J1939 Harness Connections

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

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