C.E. Niehoff & Co. C527 Installation

C527 Alternator

Retrot/Upgrade Installation Instructions

Install alternator as shown in Figure 1:

1. Units are shipped with shaft collar, disc spring
washer and nut. Remove and discard shaft collar.
Install pulley and furnished disc spring washer.
Torque nut to 135 Nm/ 100 lb. ft.

2. Install alternator on pad mount per vehicle manu­facturer’s instructions, including hardware specifi­cations and torque.

3. All cabling, wiring or conduit must be supported
within 305 mm/12 in. of termination on alternator.

4. Choose wire gauge for B+ and B– cables capable of
handling maximum alternator output with mini­mum voltage drop.

5. Install regulator as follows:

A2-334—install regulator on alternator and torque

mounting screws to 8.5 Nm/75 lb. in. Plug alterna­tor-to-regulator harness securely into regulator.

A2-335—install regulator in remote location as

specified by customer. Plug alternator-to-regulator
harness securely into regulator.

A2-348—install regulator on alternator and torque

mounting screws to 8.5 Nm/75 lb. in.
– Plug alternator-to-regulator harness securely
into 5-socket receptacle on regulator.
– Plug temperature sensing/voltage sensing
harness from vehicle into 5-pin receptacle on
regulator.

A2-350—install regulator in remote location as

specified by customer.
– Plug alternator-to-regulator harness securely
into 5-socket receptacle on regulator.
– Plug temperature sensing/voltage sensing
harness from vehicle into 5-pin receptacle on
regulator.

6. Make electrical connections to regulator as
required, using proper ring terminals (follow vehicle
manufacturer’s diagram packed with extended wir­ing harness when used):

a. Make sure alternator-to-regulator harness

is plugged securely in regulator receptacle.
b. Torque terminal nuts with disc spring washers
to 4.5 Nm/40 lb. in.

• P terminal taps AC voltage, typically half
the charge voltage.

• IGN terminal provides external energize
on A2-334 and A2-335 regulators only.

Regulator P terminal;
torque to 4.5 Nm/40 lb. in.

B+ terminal M10x1.5 Bolt –
torque to 15 Nm/11 lb. ft.



M20x1.5 Nut

torque to 135 Nm/100 lb. ft.







Disc spring washer





Alternate mounting locations
for A2-348 or A2-334
(3 different locations on
circumference of shell)

B– terminal

M8x1.25 Bolt –

torque to 10.8 Nm/8 lb. ft.

Figure 1—C527 Alternator w/A2-348 Regulator (shown) Installation Details

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

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