C.E. Niehoff & Co. A1-102, A1-104 Installation
A1-102/A1-104 Alternators
Installation Instructions
INSTALLATION
Alternators intended for marine use must be installed in conformance with TITLE 33 CFR PART 183
SUBPART I - ELECTRICAL SYSTEMS.
1. MOUNT FAN AND PULLEY (Figure A).
Torque to 50 ft. lbs. using locknut and hardened washer (A1)
supplied on alternator shaft.
2. MOUNT AND CONNECT REGULATOR (Figures B and C).
a.
Position regulator plug and secure regulator with screws (B1)
provided in regulator package. Regulator plug must be securely
held in place by regulator (B2).
b.
Connect alternator plug to regulator plug (C1).
3. POSITION GROUND LINK (Figure C).
Units are shipped with the ground link installed for negative
ground as shown (C2). Reverse connections for positive ground
as indicated by dotted line (C3).
4. INSTALL ALTERNATOR (Figure A).
a.
Attach belt adjusting bracket with bolt (A2) included in parts
package.
Insert mounting bolt and hand tighten nut (A3). Bolt should be
b.
new and SAE Grade 5 or better. Nut should be self locking or
coated with "Loctite Lock and Seal" or eqivalent.
5. SET BELT TENSION (Figure A).
a.
On engines where the belt drives only the alternator, use a belt
tension gauge and set tension at 40 to 50 lbs. New belts should
be set at 75 lbs. On engines where the belt also drives other accessories, consult manufacturer's specications. If belt tension
gauge is not available, set tension so that the fan cannot be turned
by hand. CAUTION: DO NOT SET TENSION TOO HIGH AS
THIS WILL CAUSE PREMATURE BEARING FAILURE.
b.
Tighten bolt (A2) on belt adjusting bracket. Torque to 17 ft. lbs.
c.
Tighten mounting bolt (A3). Torque to 35 ft. lbs.
WIRING
CAUTION: Connecting the alternator improperly can cause serious damage.
1. For negative ground systems, connect existing battery wire to "BAT+" (D1) on alternator. For positive ground systems, connect battery wire
to "BAT-" on alternator. Be sure ground link is positioned correctly (C2 or C3).
2. On negative ground applications where a warning light is used, connect wire from "R" (D2) terminal on the alternator to the A2-250 relay
(D3).
NOTE: For isolated ground applications, discard the ground link. Attach both the positive and negative leads directly to the alternator.
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TROUBLE SHOOTING
AMP S VOL TS
LOW OR 0
NORMAL
13.0 to 14.8
Charging system operating properly.
LOW OR 0
LOW
Less than 13.0
1. Check belt tension.
2. Bypass regulator. See figure C below.
HIGH
HIGH
More than 14.8
1. Check regulator connections and grounds.
2. If voltage is still high, replace regulator.
HIGH
LOW
Less than 13.0
Discharged or defective battery.
Charge or replace battery.
SYSTEM SPECIFICATIONS
BRUSHLESS
ALTERNATOR
EXTERNAL
REGULATOR
MINIMUM
WIRE SIZE
(AWG)
VOLTS AMPS GROUND
MAXIMUM
RPM
REGULATOR
WEIGHT
(POUNDS)
STEPS
VOLTAGE
SETTINGS
A1-102 A2-102 6 12 60 N OR P 10,000 2 13.8 / 14.5 18
A1-104
A2-102
4
12
80
N OR P
10,000
2
13.8 / 14.5
18
If, after installation, the system does not meet specications:
1. Review installation instructions step by step.
2. Check all wiring for clean and secure connections.
3. Excite eld coil to re-establish magnetic eld in rotor core. See instructions below for details.
4. If system still does not operate properly, connect ammeter and voltmeter to read alternator output. Set engine R.P.M. at 1500 to 2000.
Read amps and voltage and compare to chart.
Re-establishing magnetic eld.
There are several conditions which may cause the alternator to loose its magnetic eld. To re-establish the magnetic eld, perform the
following procedure:
With engine running, disconnect plug between alternator and regulator and momentarily touch the male terminal (E1) from
the alternator plug to the negative output stud (E2) on the alternator (Figure E). Caution: Touching regulator terminal to
the negative output stud must be rapid to avoid possible alternator damage.
If no output is obtained - See Service Manual for specic alternator test.
FAN AND PULLEY INFORMATION
Use Fan & Pulley Assembly: A3-300, A3-301, A3-302, A3-303; or, Fan A3-101 with A3-403 Bushing and A3-202 or A3-203 Pulley.
Any keyed alternator pulley with appropriate dimensions can be used with A3-403 Bushing and A3-101 Fan.
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
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