Title: Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams Wiring Diagrams
1Wiring Diagrams Wiring Diagrams Wiring Diagrams
Wiring Diagrams Wiring Diagrams Wiring Diagrams
Wiring Diagrams Wiring Diagrams Wiring Diagrams
Wiring Diagrams Wiring Diagrams Wiring Diagrams
Wiring Diagrams
2Schematics
- Wiring Diagrams or Schematics use a symbolic
language - Understand the symbols and the diagrams will talk
to you - What it can tell you is how and where to test the
system
3Listen to the Diagram!
- Wiring Diagrams explain how a circuit works
- All electrical circuits need Power (positive
voltage), conductors, controls, loads. - To understand how a circuit works you must trace
powerflow through the conductors, controls, and
loads.
4Power at the top!
- Positive voltage is often called power.
- Positive voltage usually originates in the top
and left side of the diagram. - Ground is usually found at the bottom and right
side of the diagram.
5Power(Positive Voltage)
Ground(Negative Voltage)
6How many volts?
How many volts?
How many volts?
7Understand the Symbols
- Wiring diagrams contain lots of information
- Pay attention to the little details!
8Wires cross with NO electrical contact
Wires cross with soldered splice, will have
electrical contact
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10A 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.
11The Engine Compartment Fuse/Relay Box has other
wires, fuses etc.
If I wanted to test the blower fuse I would not
be surprised to find other fuses in this box
The entire Blower Motor Switch is shown in this
schematic
To find this switch I would look for a switch
with four wires.
12How many wires go to this relay?
How many wires to the stoplight module?
13More Dashed Lines
- A dashed or dotted line can mean there is more
than is shown on the page.. - ..Or there are other wires hooked to the
circuit, but not shown in the diagram - ..Or what controls a switch.
14 A dashed or dotted line can mean there is more
than is shown on the page
15Dashed box means the entire Turn/Hazard Switch is
not shown
16 A dashed line can indicate there are other wires
common to the circuit, but not shown in the
diagram
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19A dashed line indicatesswitches are linked
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23Other switches inside the headlamp switch operate
independently
24Other switches inside the headlamp switch operate
independently
25When this coil turns ON
this switch will move
This switch is moved by Temperature
This switch is moved by Pressure
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27What does this dotted line mean?
What does this dotted line mean?
What does this dotted line mean?
What does this dotted line mean?
What does this dotted line mean?
What does this dotted line mean?
What does this dotted line mean?
28Details on Switches
29Draw a continuity block
30Wire Details
- Schematics will often indicate
- .wire color
- .wire gauge size
- .circuit code
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32Wire Gauge
Which is the larger wire?
AWG AmericanWire Gauge
- 4
- 12
- 14
- 16
- 18
- 20
- ???????
- 4!
- 19.0
- 3.0
- 2.0
- 1.0
- 0.8
- 0.5
- ??????
- 19.0!
Metric wire size
33Not 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
34Circuit Code
35Not 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
- available to diagnose and fix the problem!!