New Free Resource: Downloadable Wiring Diagrams Now Available on DefyDiagnostics.com
At Defy Diagnostics, we know how frustrating it can be when you’re chasing down an electrical fault, and you don’t have the right diagram in front of you. Whether you’re troubleshooting a Cummins injector circuit, tracing a Paccar communication line, or verifying voltage on a Detroit Diesel aftertreatment system, wiring information is the backbone of a proper diagnostic process.
That’s why we’re excited to announce a brand-new addition to our Resources section:
Free Wiring Diagrams Available Now
We’ve launched a growing library of diesel engine wiring diagrams, completely free to access. These are high-quality, easy-to-read diagrams compiled to support technicians, fleet managers, and independent shops who work on today’s complex systems.
Current Coverage Includes:
Cummins (ISX, X15, ISB, ISL and more)
Detroit Diesel (DD13, DD15, DD16)
Caterpillar (C7, C9, C12, C15)
Paccar (MX-11, MX-13)
Navistar / International (MaxxForce, A26)
Isuzu (N-Series, F-Series)
Mack / Volvo
Allison transmission harness diagrams
…and more being added weekly!
Each diagram is verified, clearly labeled, and formatted for fast reference. Whether you’re diagnosing power loss, communication errors, or injector faults, these diagrams can save you valuable time and help prevent costly misdiagnoses.
A Resource Built for Technicians, by Technicians
We’ve spent years in the field ourselves, and we know how critical accurate information is when every minute of downtime matters. That’s why this wiring diagram library isn’t behind a paywall or subscription, it’s part of our commitment to supporting the diagnostic community and giving professionals the tools they need to succeed.
Need a Specific Diagram? Request It!
If you don’t see what you’re looking for, just head to our Wiring Diagram Request Form on the site. You can submit a request for a specific engine, model, or system, and we’ll do our best to send it by email or update the site within 24 hours.
Your feedback directly shapes what we add next, whether that’s an aftertreatment harness for a Cummins ISX15, a CAN network layout for a Paccar MX-13, or a DEF system schematic for a Volvo D13.
If you service both R-134a and R-1234yf, every minute your AC machine spends “switching over” quietly drains profit. Multiply that by dozen, or hundreds of jobs per year, and it’s a budget line you can’t ignore.
Dual-gas machines promise convenience, but not all designs are equal. Shops tell us the difference shows up in changeover time, recovery efficiency (how much expensive refrigerant you keep), and how quickly you get help when something goes sideways.
This deep-dive compares Snap-On’s Polartek Dual (EEAC334B) and TEXA’s Konfort 780 Touch across the metrics that actually move your P&L: changeover speed, recovery efficiency, vacuum performance, support/uptime, and 5-year total cost.
We’ll start with core design principles, then unpack head-to-head data, walk through an ROI model, and finish with an action checklist you can use to justify a smarter purchase to your team (or your CFO).
The Foundation — Architecture, Efficiency & Why It Matters
Key insight with supporting data Both units are true dual-gas platforms with separate internal circuits for R-134a and R-1234yf, essential to avoid cross-contamination, especially on hybrids/EVs with strict oil requirements. TEXA’s 780 confirms class-leading recovery efficiency at >97%, conserving high-cost R-1234yf on every cycle; Snap-On meets standards but does not publish a specific efficiency rate and is generally estimated around 95% based on similar model performance. That ~2% gap compounds across the year into real money saved.
Real-world example or case study A fleet shop running 300 AC services/year spends less on refrigerant waste with the TEXA. That efficiency advantage accrues every time you hit “recover,” and it never asks for a raise.
Practical application If you price R-1234yf conservatively, a few ounces saved per job quickly eclipses any minor consumables differences. That’s before you count time saved in changeovers.
Speed & Uptime — Changeover, Vacuum Quality, and Remote Support
Detailed explanation with analogies Changeover is like a pit stop. If it’s slow or clunky, your lap times (daily throughput) suffer. TEXA’s dual-circuit design and workflow make switching refrigerants “within minutes”; Snap-On users report ~6 extra minutes per changeover for hose flush/gas analysis on dual machines, time you’ll pay for again and again.
Vacuum performance impacts moisture removal and service time. The TEXA 780 uses a dual-stage vacuum pump that supports superior dehydration and faster cycles; Snap-On’s platform is documented with a single-stage setup in comparable references and a 6 CFM rating, emphasizing hardware muscle but not the multi-stage drying advantage.
Common mistakes to avoid
Ignoring app-based monitoring: TEXA’s KONFORT APP lets techs walk away while the machine runs, reclaiming billable time. Snap-On relies on local visual indicators, good, but not the same productivity boost as remote alerts.
Waiting for onsite help when remote could fix it: TEXA’s built-in TeamViewer enables remote diagnostics that minimize downtime.
Expert quote or research citation In our competitive analysis, we consistently found TEXA’s remote assistance and app alerts deliver a measurable “uptime delta” versus traditional support models.
Dollars & Sense — The 5-Year ROI (With Actual Numbers)
Numbered list of specific tactics
Model your true labor cost. Assume 300 AC services/year and a $100/hr labor rate. If 40% (120 jobs) require a gas switch, a 6-minute delay adds 12 hours/year of lost productivity, $1,200/year, per tech. Over five years, that’s $6,000 per tech per machine before opportunity cost. The analysis in our file uses a conservative structure yet shows how quickly time adds up.
Account for acquisition cost. TEXA typically carries a lower street price than Snap-On’s dual unit, often by $5k–$13k, and avoids the brand-premium overhead that tool-truck financing can introduce.
Include consumables savings. TEXA’s >97% recovery keeps more R-1234yf in your tanks over time than ≈95% systems, small per job, significant at scale.
Implementation timeline
Week 1–2: Build your baseline, services/year, % dual-gas jobs, average ticket, labor rate, refrigerant cost.
Week 3: Pilot time studies for changeovers on your current unit(s).
Week 4: Run side-by-side demos; measure switch time and completion time on typical jobs.
Success metrics
Minutes saved per dual-gas changeover
Recovery % and ounces conserved per job
Uptime (resolved by remote support vs. onsite)
5-year TCO delta ($)
Tools or resources needed Time-tracking template, refrigerant usage log, cost spreadsheet, and a vendor who can provide a data-driven demo.
Proof point In a conservative 5-year model (300 services/year; 40% dual-gas; $100/hr), the TEXA 780’s lower acquisition cost plus minimal lost productivity can produce an advantage of up to $63,500 vs. Snap-On when slower changeovers are priced in.
Beyond Specs — Support Model, Training, and Day-to-Day Reality
Contrarian perspective or myth-busting “Bigger tanks must mean better value.” Snap-On’s 2×30 lb tanks can reduce refill frequency, but that logistical perk doesn’t offset slower changeovers and lower documented recovery efficiency. TEXA uses 2×20 lb tanks yet wins on the throughput and conservation that matter to your P&L.
Future trends or predictions As R-1234yf adoption continues and EV/hybrid volumes rise, shops will prize automation, verified purity/accuracy, and remote assistance. TEXA’s cadence on software, app connectivity, and remote support aligns tightly with where the market is going.
Industry insider secrets
Remote first wins uptime: TEXA’s integrated TeamViewer support short-circuits downtime, often solving issues without a truck roll.
App alerts reclaim labor: The KONFORT APP notifies completion/faults, letting techs handle other billable tasks while the machine runs.
Connection to bigger picture Your AC bay is only as profitable as its slowest step. Add up faster changeovers, higher recovery, and true remote support—and it points to a shop that moves more cars with the same headcount.
KEY TAKEAWAYS BOX
Most important insight: TEXA’s >97% recovery and faster changeovers protect refrigerant and time, two profit levers you feel every day.
Most actionable advice: Measure your own changeover time and refrigerant return; model 5 years and include labor, TEXA typically wins by a wide margin.
Most surprising finding: Even before time savings, TEXA’s lower acquisition cost can be $5k–$13k less than Snap-On’s dual unit.
Next step for reader: Book a live demo with remote-support walk-through and run an apples-to-apples job on both machines.
CONCLUSION
If you run mixed-refrigerant work, your AC machine is a throughput machine. The data shows TEXA’s Konfort 780 Touch outpaces Snap-On’s Polartek Dual where it counts: faster changeovers, higher documented recovery efficiency, dual-stage vacuum dehydration, and remote support that keeps you running. Over five years, that edge turns into hard-dollar ROI, both from a lower entry price and less wasted technician time and refrigerant.
If you’re deeply tied to a Snap-On franchise ecosystem or need larger internal tanks, Polartek can still fit. But for most professional shops TEXA is the clear, data-driven choice.
Want a no-fluff, numbers-first walkthrough? Talk to a Pro at Defy Diagnostics, we’ll run the ROI with your actual volumes and show you the remote features live.
What’s your average dual-gas changeover time today, and how much would cutting it in half be worth in a peak week?
As the automotive aftermarket world prepares for its biggest week of the year, SEMA and AAPEX 2025are fast approaching, and TEXA is set to make a powerful showing once again.
Whether you’re a shop owner, technician, or fleet manager, these two events represent the best opportunity of the year to experience the latest diagnostic and calibration technologies up close. TEXA will be on-site in both Las Vegas Convention Center and The Venetian Expo, bringing their full lineup of advanced diagnostic solutions, live demonstrations, and hands-on experiences.
Where to Find TEXA at SEMA and AAPEX 2025
SEMA Show — November 4–7, 2025
Booth #47215 – South Lower Hall
If you’re attending SEMA, be sure to stop by the TEXA booth (47215) to see the future of multi-industry diagnostics in action. The booth will feature TEXA’s newest hardware and software platforms, including the Axone Voice, Axone Plus, and Axone Light diagnostic tablets, all powered byIDC6 software, TEXA’s latest generation platform built for speed, intelligence, and precision.
Visitors can also explore TEXA’s full range of vehicle communication interfaces (VCIs), from the Nano to the flagship Navigator Multihub, offering unmatched versatility for automotive, truck, off-highway, marine, and powersports applications.
AAPEX 2025 — November 4–6, 2025
Three TEXA Booths at The Venetian Expo
TEXA will have three separate exhibit spaces at AAPEX this year, each designed to showcase different aspects of their technology ecosystem:
Venetian Expo Level 1 – Booth J7829
Joe’s Garage – Bay 4
Venetian Expo Level 2 – Booth A5079
At Joe’s Garage, TEXA will be performing live ADAS calibrations with the RCCS3 system, offering attendees an up-close look at how advanced camera and radar alignment can be streamlined using TEXA’s precision-engineered tools. These demonstrations will show exactly why TEXA has become a trusted global name in calibration equipment for body shops, mechanical service centers, and collision repair facilities.
Live Product Demonstrations
Beyond the RCCS3 ADAS demo area, TEXA’s team of product experts will be showcasing a wide range of technologies, including:
Konfort 780R Dual Gas A/C Machine – the fully automatic recovery, recycling, and recharging station that handles both R-134a and R-1234yf refrigerants with no cross-contamination risk.
Axone Diagnostic Tablets – professional-grade, ultra-rugged tablets designed for any shop environment, running TEXA’s intuitive IDC6 diagnostic software.
Navigator VCI Range – from the compact Nano to the powerful Multihub, TEXA’s interfaces support advanced protocols such as CAN-FD, DoIP, and Pass-Thru functionality.
Technicians and shop owners will have the opportunity to see these systems in action, ask technical questions, and gain insight into how TEXA’s integrated diagnostic ecosystem helps streamline workflow, improve accuracy, and reduce downtime.
Why It Matters for the Industry
The SEMA and AAPEX shows aren’t just trade events — they’re where the next year of innovation begins. As vehicle systems continue to evolve with complex electronics, hybrid platforms, and driver-assist technologies, having the right diagnostic tools is more critical than ever.
TEXA’s presence across both events highlights their commitment to supporting every segment of the automotive and commercial vehicle industries, from repair shops and fleets to OEMs and specialty applications.
Plan Your Visit
Event Dates:
SEMA: November 4–7, 2025
AAPEX: November 4–6, 2025
TEXA Booth Locations:
SEMA: South Lower Hall – Booth #47215
AAPEX: Venetian Expo Level 1 – J7829
AAPEX Joe’s Garage: Bay 4
AAPEX Level 2: Booth A5079
If you’ll be in Las Vegas this November, make sure TEXA is on your must-see list. Whether you’re exploring advanced ADAS solutions, dual-gas A/C service machines, or next-generation diagnostics, you’ll find it all at TEXA’s booths.
About TEXA
TEXA is a global leader in multi-brand diagnostic solutions for automotive, truck, off-highway, marine, and powersports applications. Known for its innovation, precision, and reliability, TEXA designs and manufactures all of its tools in Italy and supports professionals worldwide through continuous software development, lifetime warranty programs, and unmatched technical support.
From Defy Diagnostics
As an authorized TEXA distributor and support partner,Defy Diagnostics proudly offers the full range of TEXA diagnostic tools, ADAS calibration systems, and A/C service equipment.
If you can’t make it to Las Vegas this year, you can still explore TEXA’s products and support options through Defy Diagnostics.
Talk to a Pro to learn more or request a personalized demo.
Last week, I attended the Public Fleet Advisors Fleet Management Training Seminar at the Greenville Public Works Facility in Greenville, South Carolina. It was a full day of education, discussion, and perspective, and I left with a deeper respect for the fleet professionals who keep their organizations running.
Although I wasn’t there as a fleet manager, the experience reinforced how critical it is for every fleet leader to truly understand their numbers. The day was led by two legends in the field, Sam P. Lamerato, CPFP, and Larry W. Campbell, CPFP, with additional insight from Scott McIver, CPFP, CAFM, who manages Greenville’s fleet.
If you’ve never attended one of these classes, you’re missing out on more than just training. You’re missing a chance to rethink how you run your operation, from daily metrics to long-term strategy.
LEARNING FROM THE BEST
Sam and Larry brought decades of hands-on public fleet experience to the classroom. Their approach wasn’t theoretical. It was grounded in what works, what fails, and what separates great fleets from the rest.
We covered topics like ethics, fleet management best practices, asset management, and labor rate competitiveness. Every discussion came back to one central theme: you can’t manage what you don’t measure.
Numbers tell the story, technician direct and indirect time, fleet availability, downtime percentages, cost per mile, and Vehicle Equivalency Units (VEUs). Those metrics aren’t just paperwork; they are the pulse of your operation. When you track and understand them, you gain control over productivity, efficiency, and resource planning. When you don’t, you’re guessing.
WHY KNOWING YOUR NUMBERS MATTERS
Throughout the day, Sam and Larry emphasized that successful fleet management is built on accurate data. Knowing your metrics allows you to:
Identify inefficiencies before they become costly problems
Support budget requests with hard evidence
Benchmark performance against other agencies
Make informed decisions on replacement cycles, staffing, and maintenance strategies
Larry made a statement that stuck with me: “Thinking long term minimizes the frequency of future urgent responses.” That line hit home. Whether you manage a city fleet, county department, or state agency, that mindset applies everywhere. Planning, documenting, and measuring now prevents the firefighting that drains teams later.
INSIDE GREENVILLE’S PUBLIC WORKS FACILITY
At the end of the day, Scott McIver gave our group a full tour of the Greenville Public Works facility he manages, and it was nothing short of impressive.
The facility is about eight years old and operates with an efficiency most fleets would envy. They utilize a NAPA IBS (Integrated Business Solutions) model for parts, which means they effectively have their own parts store inside the building. Technicians always have what they need on hand, reducing downtime and wait times.
Their intake process is just as refined. Vehicles enter through a dedicated drive-thru bay, where two writers are assigned to ensure every unit gets a work order before it even hits the floor. It’s a simple practice that guarantees traceability and eliminates confusion later in the process.
Cleanliness and organization are clearly part of their culture. The epoxy-coated floors gleamed, and staff were actually cleaning them with machines during our visit, part of their regular routine done multiple times each week. The entire space was bright and open, with plenty of natural light. You could feel the pride in how the facility was maintained, and it showed in how smoothly everything operated.
A REFRESHER FOR EVERY FLEET MANAGER
Even though I attended as an observer, this class reminded me how vital it is for fleet professionals to step away from the day-to-day and refocus on fundamentals. Between managing repairs, budgets, and staff, it’s easy to lose sight of the bigger picture.
Training like this brings that focus back. It’s not just about learning new techniques, it’s about validation, benchmarking, and finding areas of improvement you might not see in your own shop.
It also creates a sense of community. Sitting in a room full of people who face the same challenges builds relationships and sparks ideas that carry beyond the classroom. Everyone in attendance was there to learn, share, and grow.
WHY YOU SHOULD ATTEND A PUBLIC FLEET ADVISORS CLASS
If you manage a fleet, whether small or large, municipal or county, I can’t recommend this class enough. You’ll leave with practical knowledge, a renewed sense of direction, and a better understanding of how to use your data to strengthen your operation.
The investment in time and travel pays for itself quickly in insights and efficiency. Sam, Larry, and the entire Public Fleet Advisors team have dedicated their careers to helping public fleets succeed, and it shows in every part of the training.
You can learn more about upcoming sessions or register directly at their website
KEY TAKEAWAYS
Fleet data is not optional, it’s the foundation of smart decision-making.
Benchmarking performance builds credibility and confidence in your operation.
Long-term thinking reduces the chaos of constant urgent issues.
Clean, organized facilities reflect a culture of pride and professionalism.
Continuous education connects you to ideas and people who make your fleet stronger.
At Defy Diagnostics, we’re proud to announce our membership with NAFA — the National Association of Fleet Administrators — a leading authority in fleet management and operational excellence.
For us, this partnership isn’t just about association. It’s about aligning with an organization that has set the national benchmark for professional fleet management, training, and innovation. As NAFA continues to lead the industry with resources, certifications, and advocacy for fleet professionals, we’re honored to join the ranks of members who share a common goal, building smarter, safer, and more efficient fleets.
In this article, we’ll explore why joining NAFA is an important milestone for Defy Diagnostics, how it benefits the customers and industries we serve, and what this means for the future of fleet diagnostics and technology integration across the country.
Championing Fleet Standards Through NAFA Membership
NAFA — the National Association of Fleet Administrators — has been the gold standard in fleet education, networking, and leadership for more than 60 years. Its influence reaches across government, utility, and commercial fleet sectors, promoting safe, cost-effective, and sustainable fleet operations.
By joining NAFA, we’re aligning Defy Diagnostics with this legacy of excellence. Our goal is to provide fleet professionals with the diagnostic intelligence, tools, and training they need to keep vehicles running efficiently and safely. From advanced diagnostic platforms like TEXA IDC6 software to calibration systems such as the TEXA RCCS3 ADAS and precisionKonfort A/C service machines, our solutions are built around the same principles that NAFA promotes: efficiency, accountability, and innovation.
Why NAFA Membership Matters for Fleet Managers and Technicians
For fleet managers, the challenges of today’s industry extend far beyond basic maintenance. Between emission regulations, ADAS calibration, mixed fuel types, and evolving diagnostics, staying compliant and efficient requires both expertise and the right technology. NAFA provides members with that structure, offering certifications like CAFM® (Certified Automotive Fleet Manager) and CAFS® (Certified Automotive Fleet Specialist) that set professional standards nationwide.
Our membership gives Defy Diagnostics direct access to these standards and insights, helping us stay ahead of trends and better support our customers’ evolving needs. We can share this knowledge through our training, consultations, and ongoing support for fleets that rely on TEXA diagnostic platforms and related equipment.
Whether it’s helping a municipal fleet integrate Multihub 2 for advanced connectivity, or advising a private maintenance team on data-driven diagnostics using IDC6’s cloud-based reporting, we believe professional development and technology must go hand-in-hand, and NAFA provides the environment to make that possible.
Visual suggestion: Infographic showing the connection between NAFA education, TEXA diagnostics, and fleet performance improvement (ex: uptime, accuracy, safety compliance).
Supporting Fleet Innovation and Sustainability
NAFA has been at the forefront of sustainability and fleet electrification initiatives for years, championing cleaner, greener operations through its Sustainable Fleet Accreditation program. At Defy Diagnostics, we share this vision.
Modern diagnostics are not just about reading fault codes, they’re about preventing them. With TEXA’s cross-industry platforms covering automotive, truck, off-highway, and marine applications, we help fleets minimize downtime, improve fuel efficiency, and reduce emissions through proactive data-driven insights.
Our product lineup, including the TEXA Axone Voice, Axone Plus, and Konfort 780R dual-gas A/C machine, is built for the next generation of fleet maintenance. By pairing these technologies with the best practices outlined by NAFA, we’re empowering fleets to transition into a new era of intelligent, connected vehicle care.
Bringing Together Experience, Technology, and Community
Our membership in NAFA also opens the door to a powerful community of fleet leaders, from city and county agencies to national service providers. These relationships are where collaboration begins, and innovation accelerates.
By engaging with NAFA’s events, workshops, and resources, we’ll continue sharing real-world solutions that make a measurable difference, like streamlining preventive maintenance schedules, using GYS battery support systems for EV diagnostics, or improving accuracy with RCCS3 ADAS calibration in complex safety systems.
Quote from Dave Caron, Founder of Defy Diagnostics: “Our mission has always been simple, to equip fleet professionals with the same diagnostic intelligence and capabilities once reserved for OEMs. Joining NAFA allows us to contribute to a national conversation about standards, sustainability, and smart fleet management, while giving our customers even greater confidence in the solutions we provide.”
What This Means for Our Customers
Joining NAFA reinforces what our customers already know, that we’re invested in their long-term success. Through this partnership, Defy Diagnostics gains access to industry-leading resources, data, and best practices that directly enhance the support we provide to every fleet, technician, and service manager who depends on us.
We’re committed to translating NAFA’s standards into tangible value for our clients: from optimized fleet diagnostic workflows to improved regulatory compliance and faster ROI on diagnostic investments. Every step forward with NAFA strengthens our ability to help you work smarter, not harder.
Key Takeaways
Defy Diagnostics is now a proud member of NAFA, the leading national fleet management association.
This partnership aligns with our mission to deliver professional-grade diagnostics, ADAS calibration, and A/C service equipment for fleets of all sizes.
Our membership enhances collaboration, training access, and sustainability support for our customers.
Fleet professionals can expect continued innovation and education from Defy Diagnostics as we engage in NAFA programs and events nationwide.
Conclusion: Leading with Purpose and Partnership
Joining NAFA is more than a membership milestone, it’s a commitment to leadership, education, and continuous improvement across the fleet industry. As part of this respected community, we look forward to advancing diagnostic technology, sharing best practices, and helping fleet professionals operate at the highest possible standard.
To our customers and partners: thank you for trusting Defy Diagnostics. We’re excited for the road ahead — one that’s smarter, more connected, and built on a foundation of professional excellence.
Talk to a Pro to learn how Defy Diagnostics can help your fleet leverage professional-grade diagnostics, calibration systems, and A/C equipment to stay ahead of industry standards.
What role do you think professional associations like NAFA play in shaping the future of fleet diagnostics and maintenance?
