july2023 - 14

» Check fuses and relays whenever you have circuit issues to ensure that nothing has blown or is faulty.
Diesel Laptops
Streamlining electrical system repairs
According to Michael Whitman, director of product management at
Optronics International, here are some tips to help you streamline the
process and accuracy of electrical and lighting system repairs:
UNDERSTAND COMMON PROBLEMS AND SYMPTOMS
* Dim or flickering lights indicate a potential issue with the battery,
alternator, or wiring connections.
* Total loss of lights could be due to a blown fuse, faulty switch, or broken wiring.
* Intermittent electrical issues suggest loose or corroded connections,
damaged wiring, or a faulty component.
* Faulty turn signals or brake lights may point to a malfunctioning
relay, broken wiring, or a defective bulb.
* Wiring and harness problems usually come in three categories, each
with its own signs and troubleshooting procedures to follow:
» Failure due to a grounded circuit
» Failure due to an open circuit
» Failure due to a short circuit
DIAGNOSTIC PROCEDURES
Step 1: Gather information and perform a visual inspection, interview the driver to understand
the symptoms and any recent changes they may have observed, and inspect the affected lighting
system components, looking for visible damage, loose connections, or signs of overheating.
Step 2: Test the power source using a multimeter to measure battery voltage and check for
proper charging from the alternator, ensure battery terminals are clean and secure.
Step 3: Check the fuses and relays using a circuit tester or test light to check for blown fuses or
faulty relays.
Step 4: Inspect wiring and connectors for damage, loose connections, or corrosion. Look for
wires and cables that are bent sharply and those that contact metal edges, such as where wires
pass through walls or into body cavities. Use a multimeter to check for continuity and measure
resistance.
Step 5: Test the lighting components, using a test light or multimeter to check if power is reaching
the bulbs and connectors.
" Remember to consult the service manual or wiring diagrams for the vehicle you are working on
as procedures and electrical system designs can vary, " Whitman concluded.
» A digital multimeter is key to diagnosing an
electrical component with reduced output.
Diesel Laptops
reduced supply voltage was noted. Using this
method, you can isolate the portion of the harness
causing the voltage drop. "
Do no harm while diagnosing
Corrosion occurs when moisture enters at points
such as connectors, damaged wires, or improperly
repaired wires and spreads, shorting out the light,
related Dan Miller, field service manager, Peterson
Manufacturing. " One of the common ways moisture
enters wiring is during diagnostic testing when
technicians use a piercing probe that can create an
open path for moisture to enter the wiring.
" A multimeter is a better tool because it will
tell you if you have the right voltage, not just
whether or not voltage is present, " Miller continued.
" When a tech goes through troubleshooting
steps, voltage information will be available with
the use of the multimeter. "
14 Fleet Maintenance | July 2023

july2023

Table of Contents for the Digital Edition of july2023

Hitched Up – Using AI without losing what's important to your business
Equipment – AEB adoption speeds ahead
In The Bay – Bright ideas to speed up lighting and electrical repairs
Shop Operations – Battle of the bulging budget
Lubrication – Greasing: Manual or auto?
APUS – APU innovations take heat off fleets
Diagnostics – Don't distress; de-stress your diagnostic process
Technology & Maintenance Council Annual Meeting & Skills Contest
Fleet Parts & Components
Tools & Equipment
Product Spotlight: Wheels and brakes
july2023 - 1
july2023 - 2
july2023 - 3
july2023 - 4
july2023 - 5
july2023 - Hitched Up – Using AI without losing what's important to your business
july2023 - 7
july2023 - Equipment – AEB adoption speeds ahead
july2023 - 9
july2023 - 10
july2023 - 11
july2023 - In The Bay – Bright ideas to speed up lighting and electrical repairs
july2023 - 13
july2023 - 14
july2023 - 15
july2023 - 16
july2023 - 17
july2023 - Shop Operations – Battle of the bulging budget
july2023 - 19
july2023 - 20
july2023 - 21
july2023 - Lubrication – Greasing: Manual or auto?
july2023 - 23
july2023 - APUS – APU innovations take heat off fleets
july2023 - 25
july2023 - Diagnostics – Don't distress; de-stress your diagnostic process
july2023 - 27
july2023 - Technology & Maintenance Council Annual Meeting & Skills Contest
july2023 - 29
july2023 - 30
july2023 - 31
july2023 - 32
july2023 - 33
july2023 - 34
july2023 - 35
july2023 - 36
july2023 - 37
july2023 - Fleet Parts & Components
july2023 - 39
july2023 - Tools & Equipment
july2023 - 41
july2023 - Product Spotlight: Wheels and brakes
july2023 - 43
july2023 - 44
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