Ce-niehoff-co C840D Troubleshooting Guides User Manual download pdf

Page 1

TG77A

C840D Alternator

Troubleshooting Guide

C.E. Niehoff & Co.

Table of Contents

Section A: Description and Operation .......................... 2

Section B: Schematic Diagram .................................... 3

Section C: 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 bur-

den 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.

• Be sure to use CEN tools designed especially for

troubleshooting CEN alternators when available.

See page 1 for more information.

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 bur-

den 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.

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.

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.

WARNING

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

can cause severe personal injury,

death, or substantial property

damage if ignored.

Indicates presence of hazards that

will or can cause minor personal

injury or property damage.

CAUTION

Tools and Equipment

• Digital Multimeter (DMM)

• Ammeter (digital, inductive)

• Jumper wires

• CEN 6-pin Inline Harness Test Tool A10-114

Figure 1—CEN 6-pin Inline Harness Test Tool A10-114

Before troubleshooting any CEN products, the service technician should:

• 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.

WARNING

1 2 3 4 5

Summary of Contents

Page 1 - C.E. Niehoff & Co

Page 1TG77AC840D Alternator Troubleshooting GuideC.E. Niehoff & Co.Table of ContentsSection A: Description and Operation ...

Page 2 - DO NOT USE POSITION # 4

Page 2TG77ASection A: Description/OperationCEN C840D Alternator/Regulator Description and OperationC840D 28 V, 525 A alternator is internally rectifie

Page 3 - Section B: Schematic Diagram

Page 3TG77ASection B: Schematic DiagramFigure 4 — C840D Alternator Schematic DiagramB– TerminalB+ TerminalD+ TerminalIGN TerminalFigure 3 — C840D Alte

Page 4 - General Troubleshooting

Page 4TG77ALED COLOR STATUSTABLE 2 – A2-346 Regulator LED DiagnosticsAlternator and regulator operating normally.GREEN SolidLow system voltage — El

Page 5

Page 5TG77ASection C: On-Vehicle Troubleshooting (CONT’D)No Alternator Output – Test Charging Circuit• TEST MEASUREMENTS ARE TAKEN ON HARNESS PLUG AT

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Ce-niehoff-co C840D Troubleshooting Guides User Manual

Browse online or download User Manual for Hardware Ce-niehoff-co C840D Troubleshooting Guides. C.E. Niehoff & Co. C840D Troubleshooting Guides User Manual

Summary of Contents

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