Transcript Lighting & Wiring Funds

Lighting and Wiring
Fundamentals
Chapter 36
Page 466
Primary verses Secondary Wiring
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Primary wiring carries around 12 volts. Almost all
wiring in your vehicle is “primary”
Secondary wiring carries high voltage (up to
100,000 volts) The ignition system is the only
wiring that is secondary. (spark plug wires)
Circuit Protection
Devices
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Fuses
Controls Devices
Switches for on and off
Fuses and Circuit Breakers
Protect form Overloads
Fuse links
A fuse link is a piece of smaller (weaker) wire
linking a regular wire. If the circuit is overloaded
then the link burns and breaks contact. This
section is coated with a fire retardant material.
Types of lights
Rear tail Lights
Must be Red
Head Lights
Various Bulbs
Sealed Beam
Socket type
Side Marker
Headlight Operation
Standard Lighting Verses Halogen
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Standard lighting is most common with all lights except
headlights. Standard light bulbs need to be handled with
care.
Halogen lights burn extremely bright and Hot. Don’t
touch then when on and try not to handle them by
touching the glass. Your fingerprint-if left on it will make
the light fail quickly. (halogen bulbs can be blue in color)
High Intensity Discharge (HID)
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Gives off a blue color
These bulbs are filled with Zenon
The reaction causes an arc which is very bright.
These bulbs take 3-5 seconds to fully brighten, once on,
they use 25% less power than halogen lights.
Caution- High Voltage is produces at the bulb (800
volts) this is used to start it’s arc
Don’t use test equipment on it. Either it’s working or
not. (Voltage is too high for our meters)
Dimmer Switch
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Change from high to low beams
It has a flash option at times to notify oncoming
traffic
Some cars have auto dimmers-optical sensors
detect oncoming cars and dim the lights for you
Can be located on the floor or on most modern
vehicles –they are incorporated in the turn signal
arm
Courtesy Lights
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Includes dome, glove box, under hood, floor,
dash and trunk lights
Can be operated through headlight switch and
another near headlight switch
Will dim through headlight switch (dash)
Door, hood, and trunk switches control those
lights
Tail Lights
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On with light switch
Red in color
Incorporated in an assemble with brake and
back up lights
Socket type bulbs
Fused as parking lights or tail lights
Brake Lights and Turn Bulbs
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Many light bulbs have more than one
filament inside them. These bulbs
normally have offset pins to ensure proper
locking in the socket. Be sure to look
carefully at the bulb you are replacing to
make sure you do not try to force the bulb
in the wrong way.
Some bulbs have a colored glass envelope
that enables them to be used with a clear
lens. If you replace a bulb of this type,
make sure that you replace it with one of
the same color.
Wipers and Washers
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Modern motors have a delay option
The first motors ran off vacuum from the engine that was
subject to slowing or stoppage. (rpm)
A 1968 federal law called for at least two speeds and a washer
system.
Types of Wiper Designs
Rain Sensor
System Operation
An infrared beam is reflected off the outside surface of
the windshield to the infrared sensor array. When
moisture strikes the windshield, the system
experiences an interruption to its infrared beam.
Advanced analog and digital signal processing
determines the intensity of rain or snow. The sensor
communicates to the wiper control module to switch
on the wiper motor and controls the wipers
automatically according to the moisture intensity
detected.
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Horns
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Most vehicles have two horns wired in parallel if one
fails the other will work. (one horn may have a
different tone).
A diaphragm and an electromagnet produce the
noise.
When you push the horn button it “closes” the
circuit.
Your Job.
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Complete chapter Questions 1-15 (review) and
1-10 (ASE-style). Page 476
Write on a separate paper and write out the
complete question and your answer. ( do not
write the other answer options).
Complete the chapter worksheet (I will give it
out). You may write on it.
File all items in your note book.
Notebooks will be graded in the future.