electrical shematic diagrams
TRANSCRIPT
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Wiring Diagrams Wiring
Diagrams Wiring Diagrams
Wiring Diagrams WiringDiagrams Wiring Diagrams
Wiring Diagrams WiringDiagrams Wiring Diagrams
Wiring Diagrams Wiring
Diagrams Wiring Diagrams
Wiring Diagrams
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Schematics
Wiring Diagrams or Schematics use asymbolic language
Understand the symbols and the diagramswill talk to you
What it can tell you is how and where totest the system
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Listen to the Diagram!
Wiring Diagrams explain how a circuit works
All electrical circuits need Power (positivevoltage), conductors, controls, loads.
To understand how a circuit works you musttrace powerflow through the conductors,controls, and loads.
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Power at the top!
Positive voltage is often called power.
Positive voltage usually originates in the topand left side of the diagram.
Ground is usually found at the bottom andright side of the diagram.
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Power(Positive Voltage)
Ground
(Negative Voltage)
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Understand the Symbols
Wiring diagrams contain lots of information
Pay attention to the little details!
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Wires cross withNO electrical contact
Wires cross with soldered splice,will have electrical contact
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What does this
dashed line mean?
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A dashed (or dotted) line can indicate there are other
devices not shown in this picture
To keep the diagram simple, the other electrical
components are not shown
The schematic says a 40 amp fuse is in the fuse/relay box.
The fuse should always have power to it. The dotted line
means there are other items in this fuse/relay box.
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The Engine Compartment
Fuse/Relay Box has other
wires, fuses etc.
The entire Blower Motor Switch is
shown in this schematic
If I wanted to test the blower
fuse I would not be surprised
to find other fuses in this box
To find this switch I would look
for a switch with four wires.
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How many wires goto this relay?
How many wires to thestoplight module?
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More Dashed Lines
A dashed or dotted line can mean there is morethan is shown on the page..
..Or there are other wires hooked to thecircuit, but not shown in the diagram
..Or what controls a switch.
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A dashed or dotted line can mean there
is more than is shown on the page
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Dashed box means the entire
Turn/Hazard Switch is not shown
Terminal Pins A11-A17 are
shown but not pins A1-A10
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A dashed line can indicate there are other
wires common to the circuit, but not shown in
the diagram
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This splice has five
wires in common
(parallel circuits)
This splice has other
wires, in parallel, that arenot shown in this diagram
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The dotted line means
there are other circuitssharing this ground
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A dashed line indicates
switches are linked
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Parking lamp and
Headlamp switches
are gangedtogether as indicated
by the dashed line
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Parking lamp and
Headlamp switches
are gangedtogether as indicated
by the dashed line
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Parking lamp and
Headlamp switches
are gangedtogether as indicated
by the dashed line
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Other switches
inside the headlamp
switch operate
independently
Parking lamp and
Headlamp switches
are gangedtogether as indicated
by the dashed line
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Other switches
inside the headlamp
switch operate
independently
Parking lamp and
Headlamp switches
are gangedtogether as indicated
by the dashed line
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When this coil turns ON
this switch will move
This switch is moved by Temperature
This switch is moved by Pressure
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What does thisdotted line mean?
What does thisdotted line mean?
What does this
dotted line mean?
What does thisdotted line mean?
What does this
dotted line mean?
What does thisdotted line mean?
What does thisdotted line mean?
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Details on Switches
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Draw a continuity block
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Wire Details
Schematics will often indicate
.wire color
.wire gauge size
.circuit code
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Wire Color
Wire Gauge
Circuit Code
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Wire Gauge
4
12
1416
18
20???????
4!
19.0
3.0
2.01.0
0.8
0.5??????
19.0!
Which is the larger wire?AWG
American
Wire Gauge
Metric
wire size
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Not all schematics are the same
Some diagrams will leave out detail
Color Codes change .
.B could be Blue
.OR.
.B could be Black
The order of wire coding can also change
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Circuit Code
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Not all schematics are the same
When you see a new symbol
look it up!
The better you are at reading diagrams...
...the more mental power you will have
il bl t di d fi th bl !!