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C.E. Niehoff & Co. N1326-1 Troubleshooting Guides User Manual

Notice, Caution notice

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Page 1

TG0059A

Table of Contents

Section A: Wiring Diagram ......................................2
Section B: Basic Troubleshooting ............................3
Section C: Advanced Troubleshooting ......................4

Battery Conditions

Until temperatures of electrical

system components stabilize, these

conditions may be observed during cold start voltage tests.

• Maintenance/Low Maintenance Battery:

— Immediately after engine starts, system volts are

lower than regulator setpoint, and amps are

medium.

— 3-5 minutes into charge cycle, system volts

increase and amps decrease.

— 5-10 minutes into charge cycle, system volts

increase to, or near, regulator setpoint, and amps

decrease to a minimum.

— Low maintenance battery has same characteris-

tics with slightly longer recharge times.

• Maintenance-free Battery:

— Immediately after engine starts, system volts are

lower than regulator setpoint with low charging

amps.

— Once the charge cycle begins, low volts and low

amps are still present.

— After the alternator energizes, volts will increase

several tenths. Amps will increase gradually,

then quickly to medium to high amps.

— Finally, volts increase to setpoint and amps

will decrease.

The time it takes to reach optimum voltage and am-

perage will vary with engine speed, load, and ambient
temperature.

• High-cycle Maintenance-free Battery:

— These batteries respond better than standard

maintenance-free. Charge acceptance of these

batteries may display characteristics similar to

maintenance batteries.

NOTICE

Hazard Definitions

These terms are used to bring attention to presence of hazard(s)

of various risk levels or to important information concerning
product life.

Indicates presence of hazards that

will or can cause minor personal

injury or property damage.

Indicates special instructions on

installation, operation or mainte-

nance that are important but not

related to personal injury hazards.

CAUTION

NOTICE

N1326-1 Alternator

Troubleshooting Guide

Charge Volt and Amp Values

Voltage and amperage levels are functions of the battery
state of charge. If batteries are in a state of discharge,
as after extended cranking time to start the engine,
system volts when measured after the engine is started
will be lower than the regulator setpoint, and system

amps will be high. This condition is normal for the
charging system. Measured values of system volts and

amps will depend on the level of battery discharge; in
other words, the greater the battery discharge level, the
lower the system volts and higher the system amps will

be.
Voltage and amperage readings will change: System volt-
age reading will increase to regulator setpoint, and sys-

tem amps will decrease to low level (depending on other
loads) as batteries recover and become fully charged.

Low Amps: Minimum or lowest charging system

amp value required to maintain battery state of

charge; obtained when testing the charging system
with a fully charged battery and no other loads ap-
plied. This value will vary with battery type.

Medium Amps: System amp value that can cause

battery temperature to rise above adequate charging
temperature within 4-8 hours of charge time. To pre-
vent battery damage, charge amps should be de-
creased when battery temperature rises. Check bat-
tery manufacturer recommendations on proper rates

of charge amps.

High Amps: System amp value that can cause bat-

tery temperature to rise above adequate charging
temperature within 2-3 hours. To prevent battery
damage, charge amps should be decreased when the

battery temperature rises. Check battery manufac-
turer recommendations on proper rates of charge
amps.

Battery Voltage: Steady-state volt value measured

with battery in open circuit with no battery load.
This value relates to battery state of charge.

Charge Voltage: Volt value obtained when charging

system is operating. This value will be higher than
battery voltage and must never exceed the regulator

voltage setpoint.

B+ Voltage: Volt value obtained when measuring

voltage at battery positive terminal or alternator B+

terminal.

Surface Charge: Higher-than-normal battery voltage

occurring when battery is removed from battery

charger. Surface charge must be removed to deter-

mine true battery voltage and state of charge.

Significant Magnetism: Change in strength or inten-

sity of a magnetic field present in the alternator rotor
shaft when the field coil is energized. The magnetic

field strength when the field coil is energized should
feel stronger than when the field is not energized.

Voltage Droop or Sag: Normal condition which oc-

curs when the load demand on an alternator is great-
er than rated alternator output at given rotor shaft
RPM.