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Welcome to the Kenworth Training
Service Support Programs
Program One FeaturesReading Wir ing Diagrams
Click to begin
Help
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Using Web ECATF irst, a New Features window displays a hot l ink to SupportNet
Read & close if not needed
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Type in Chassis Ser ial Number & Press< enter >
388578
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Display Diagrams, Scroll & Select Diagram
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Electr ic Horn DiagramP94-1389, page 1
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Using Kenworth Wir ing Diagrams
WHAT A DIAGRAM WILL SHOW
Location of: terminals, splices, plugs, and grounds
Circuit function
Circuit numbers of all wires in a circuit
Color of all wires in a circuit
Destination of wire or purpose of the circuit
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Electr ic Horn DiagramP94-1389, page 2
P12HN
C53HN
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Using Kenworth Wir ing DiagramsWHAT A DIAGRAM WILL SHOW
Circuit function Circuit numbers of all wires in a circuit
Color of all wires in a circuit
Destination of wire or purpose of the circuit
Location of: terminals, splices, plugs, and grounds
A Wiring Key resides in ServiceNet, open the Service folder, then Class 8, and
select Electrical, next select Electrical Wiring Key, (pages 64 through 76)
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Using Kenworth Wir ing Diagrams
The first letter on each wire identifies the circuit function
Page 63 of the Electrical Wiring Key
Example: of P94-1389
P- identifies circuit function: Power
P12HN
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Using Kenworth Wir ing DiagramsWHAT A DIAGRAM WILL SHOW
Circuit function Circuit numbers of all wires in a circuit
Color of all wires in a circuit
Destination of wire or purpose of the circuit
Location of: terminals, splices, plugs, and grounds
A Wiring Key resides in ServiceNet, open the Service folder, then Class 8, and
select Electrical, next select Electrical Wiring Key, (pages 64 through 76)
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Using Kenworth Wir ing DiagramsNext, the number on each wire identifies the circuit description
Beginning on Page 65 of the
Electrical Wiring Key
Example: of P94-1389
12- circuit number gives description & colorcode:
horn relay HOT, green withwhite stripe
P12HN
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Using Kenworth Wir ing DiagramsWHAT A DIAGRAM WILL SHOW
Circuit function Circuit numbers of all wires in a circuit
Color of all wires in a circuit
Destination of wire or purpose of the circuit
Location of: terminals, splices, plugs, and grounds
A Wiring Key resides in ServiceNet, open the Service folder, then Class 8, and
select Electrical, next select Electrical Wiring Key, (pages 64 through 76)
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Using Kenworth Wir ing Diagrams
The final letters identify the destination or purpose
Page 71 of the Electrical Wiring Key
Example: of P94-1389
HN- identifies the final destination: Horn relay
P12HN
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WIRING CODE DEFINITION LIST
Example: ofP94-1389
P - identifies circuit function: Power
12 - circuit number gives description & colorcode:
horn relay HOT, greenwithwhite stripe
HN - destination or purpose: Horn
P12HN
Using Kenworth Wir ing
Diagrams
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Electr ic Horn DiagramP94-1389
Horn Relay
Horn Switch
Electric Horn
Refer to P94-1385 Charge / Start
Diagram to determine origin of supply
voltage to P82BB wire 0004
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Electr ic Horn DiagramP94-1389
P12HN
Horn Relay
Horn Switch
Electric Horn
If we press the horn button, theground is completed through the
horn switch for the control side of
the Horn Relay.
SteeringColumn
Ground
Firewall
Ground
Stud
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Electr ic Horn DiagramP94-1389
P12HN
Horn Relay
Horn Switch
Electric Horn
87
C53HN
Honk! SteeringColumnGround
Firewall
Ground
Stud
Repeat Tracing Diagram
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