Fleet Maintenance - 24

IN THE BAY

Do techs understand
the fundamentals
of electrical system
diagnosis?
Evaluate and train technicians to
improve efficiency and accuracy when
diagnosing vehicle wiring issues.
By Stefanie Von Rueden

[ ELECTRICAL SYSTEMS ]

I

magine this scenario: you have a truck that is in
the shop for a hard-cranking issue. The technician replaces the battery, replaces the starter, and
replaces the alternator, but the truck keeps coming
back to the shop with the same problem. Finally,
the technician realizes that it was a bad cable, and
all of those extra parts were replaced when they
didn't need to be.
What went wrong in the above scenario? The
technician didn't fully understand the strategy
behind electrical system diagnostics, and fell into
the trap of what John Renno, manager, Center of
Excellence, Isuzu Commercial Truck of America,
calls "swapnostics."
"One of the struggles in this industry is that
many technicians haven't been taught very well
how to apply a best practice or a theory. What
they've been taught is, 'when you see this symptom, replace this part,'" Renno explains.
When electrical systems are misdiagnosed, the
repair doesn't work and the initial problem will
recur, leading to increased vehicle downtime. If a
technician replaces a part that hasn't failed, it can
cause problems for the fleet. For example, if they
try to turn the item in for warranty and the part
is tested, the warranty claim will be rejected, says
 Continued Page 26
»»Three measurements of electricity - voltage,
amps, and resistance - are a key part of
understanding electrical system diagnosis.
Photo courtesy of Power Probe Tek

24 Fleet Maintenance | July 2019



Fleet Maintenance

Table of Contents for the Digital Edition of Fleet Maintenance

Uptime - How you can make the most out of your shop's ROs
Foundation for success: How do you find and keep technician talent?
Vehicles - Examining the e-systems available for today's fleets
In the Bay - Do techs understand the fundamentals of electrical system diagnosis?
Shop Operations - How to assess replacement parts
Reman, Rebuild, Replace - Reasons fleets should consider reman
Economic Outlook - Uncertainties with today's global economy
Tire Tactics - Factors to help determine the lifecycle of tires
Management - The "shop improvement" conundrum
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest Editorial - Increase shop efficiencies through fluid management
Fleet Maintenance - 1
Fleet Maintenance - 2
Fleet Maintenance - 3
Fleet Maintenance - 4
Fleet Maintenance - 5
Fleet Maintenance - 6
Fleet Maintenance - 7
Fleet Maintenance - Uptime - How you can make the most out of your shop's ROs
Fleet Maintenance - 9
Fleet Maintenance - Foundation for success: How do you find and keep technician talent?
Fleet Maintenance - 11
Fleet Maintenance - 12
Fleet Maintenance - 13
Fleet Maintenance - 14
Fleet Maintenance - 15
Fleet Maintenance - 16
Fleet Maintenance - 17
Fleet Maintenance - Vehicles - Examining the e-systems available for today's fleets
Fleet Maintenance - 19
Fleet Maintenance - 20
Fleet Maintenance - 21
Fleet Maintenance - 22
Fleet Maintenance - 23
Fleet Maintenance - In the Bay - Do techs understand the fundamentals of electrical system diagnosis?
Fleet Maintenance - 25
Fleet Maintenance - 26
Fleet Maintenance - 27
Fleet Maintenance - 28
Fleet Maintenance - 29
Fleet Maintenance - Shop Operations - How to assess replacement parts
Fleet Maintenance - 31
Fleet Maintenance - 32
Fleet Maintenance - 33
Fleet Maintenance - 34
Fleet Maintenance - 35
Fleet Maintenance - Reman, Rebuild, Replace - Reasons fleets should consider reman
Fleet Maintenance - 37
Fleet Maintenance - Economic Outlook - Uncertainties with today's global economy
Fleet Maintenance - 39
Fleet Maintenance - Tire Tactics - Factors to help determine the lifecycle of tires
Fleet Maintenance - 41
Fleet Maintenance - 42
Fleet Maintenance - 43
Fleet Maintenance - 44
Fleet Maintenance - 45
Fleet Maintenance - 46
Fleet Maintenance - 47
Fleet Maintenance - 48
Fleet Maintenance - 49
Fleet Maintenance - 50
Fleet Maintenance - 51
Fleet Maintenance - 52
Fleet Maintenance - 53
Fleet Maintenance - Management - The "shop improvement" conundrum
Fleet Maintenance - Fleet Parts & Components
Fleet Maintenance - 56
Fleet Maintenance - 57
Fleet Maintenance - Tools & Equipment
Fleet Maintenance - 59
Fleet Maintenance - 60
Fleet Maintenance - Classifieds
Fleet Maintenance - Guest Editorial - Increase shop efficiencies through fluid management
Fleet Maintenance - 63
Fleet Maintenance - 64
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