C.E. Niehoff & Co. N1617, N3264, N2013 Troubleshooting Guides
Troubleshooting Guide
Before troubleshooting any CEN products, the service technician should:
WARNING
• read, understand, and agree to follow all information contained in this troubleshooting guide.
• understand the operational characteristics of the electrical charging system components to be tested.
• be profi cient at the use of tools and test equipment used in troubleshooting CEN products.
for N1617 Alternator
Hazard Definitions
These terms are used to bring attention to presence of hazards
of various risk levels or to important information concerning
product life.
Indicates presence of hazard(s) that
WARNING
can cause severe personal injury,
death, or substantial property
damage if ignored.
Indicates presence of hazards that
CAUTION
will or can cause minor personal
injury or property damage.
Indicates special instructions on
NOTICE
installation, operation or mainte nance that are important but not
related to personal injury hazards.
Table of Contents
Section A: Component Description ..................... 2 – 3
Section B: On-vehicle Troubleshooting ............... 4 – 5
Testing Guidelines
Professional service technicians rely on the following
guidelines when testing electrical components.
Voltage testing:
• Set meter to proper scale and type (AC or DC).
• Be sure to zero the meter scale or identify the meter
burden by touching meter leads together. Meter burden must be subtracted from final reading obtained.
• Be sure the meter leads touch source area only.
Prevent short circuit damage to test leads or source
by not allowing meter leads to touch other pins or
exposed wires in test area.
Voltage drop testing:
• Measure voltage between B+ on alternator or source
and B- (ground) on alternator or source. Record
obtained reading. Move to batteries or other source
and measure again between B+ and B- terminals on
battery or other source. Difference between the two
readings represents voltage lost within the circuit
due to but not limited to inadequate cable gage or
faulty connections.
• Voltage drop measurements must be taken with
all electrical loads or source operating.
Resistance (ohm) testing:
• Set meter to proper scale.
• Be sure to zero the meter scale or identify the meter
burden by touching meter leads together. Meter burden must be subtracted from final reading obtained.
• Be sure the meter leads touch source area only.
Prevent altering the reading by not allowing fingers
or body parts to touch meter leads or source during
reading.
• Be sure reading is taken when source is at 70ºF.
Readings taken at higher temperatures will increase
the reading. Conversely, readings taken at lower
temperatures will decrease the reading.
• Be sure to test directly at the source. Testing through
extended harnesses or cable extensions may increase
the reading.
When testing field coil or stators,
CAUTION
most shorts to ground will measure
0-100 ohms. Test readings may also
show higher, other than OL, typi cally in the megaohm range, when
windings are dust-covered, wet,
or oily from environment. Be
sure to distinguish between
defective readings and surface
debris readings when determin ing the test results.
Dynamic/Live testing:
Definition: Connecting power and ground to a
component to test operation/function out of circuit.
1. Be sure to connect jumper leads directly and securely
to source contacts of the component being tested.
2. Be sure to make any connection to power and ground
at the power supply or battery source terminals. Do
not make connection at component source terminals
as that may create an arc and damage component
source terminals.
TG82A
Page 1
Section A: Component Description
CEN N1617
Alternator Description and Operation
N1617 570 A 28 V alternator is internally rectified.
All windings and current-transmitting components are
non-moving, so there are no brushes or slip rings to
wear out. Energize switch activates regulator. Field coil
is then energized. Alternator output current is self-limiting and will not exceed rated capacity of alternator.
N3264 remote-mounted regulator used with these units:
• regulates alternator voltage so that neither Battery A
signal nor Battery B signal exceeds 30.0 volts.
• is negative temperature compensated according
to switch-selected vehicle battery type. Switch is
factory-set to position 1. Customer selects position
per application
—Position 1 for Gel, AGM
—Position 2 for 6TLFP, 6TLMF
B+ connections on alternator
Both positive cables must be connected together at alternator or
isolator input when alternator is installed in vehicle and during
operation. Interconnect cable is part of vehicle cabling.
Interconnect
cable
Interconnect
cable
B– connections on alternator
Both ground cables must be connected to vehicle’s common
ground. An interconnect cable is required as shown if a single
cable to vehicle common ground is used.
Figure 1 — N1617 Alternator
Figure 2 — N3264 Regulator Connections
BATTERY ISOLATOR
(SEE PAGE 3 FOR DE TAILS)
Figure 3 — Schematic Diagram of N1617 Alternator with N3264 Regulator
Page 2
TG82A
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