Wiring Diagrams That Save Time—and Your Sanity
A tech is staring at a screen. Not frustrated yet—but close.
The truck came in with a check engine light and an electrical fault. Nothing too complicated—if you can find the right circuit. But the diagram they pulled is hard to read. Symbols don’t match what’s on the truck. The fuse layout is buried. The page won’t zoom. What should’ve been a 45-minute fix is about to become an all-afternoon problem.
That’s exactly why we built the Wiring Diagram tool inside Diesel Repair.
This happens all the time—especially when a newer tech is working through a system they haven’t diagnosed before. Most OEM diagrams weren’t designed to help techs solve problems. They’re archived. Inconsistent. Outdated. Or locked inside expensive software that still makes you guess your way through it.
So we rebuilt the entire experience from the ground up. Our team spent years reviewing and organizing thousands of diagrams across every major make, model, and system. We cleaned them up. Standardized them. And made them something techs could actually use—without needing a second screen just to figure out what they’re looking at.
These diagrams are designed to be useful, not just usable. Whether you’re working on HVAC, aftertreatment, ABS, or a body control module, you’re going to see consistent formatting, familiar icon sets, and labeling that matches what you’re actually seeing on the truck.
For your senior techs, that means fewer slowdowns. For your newer techs, it means more confidence and less hand-holding. And for your shop? It means faster diagnostics, fewer mistakes, and a smoother workflow overall.
We’ve watched newer techs pull up diagrams on their tablets, trace through the circuit, and fix the issue—without needing to call in backup. That’s how shops scale smarter. That’s why this tool matters.
How to Use the Wiring Diagrams Tool
Getting started is simple. Here’s how your team can look up and use diagrams inside Diesel Repair:
- Log into Diesel Repair
- Click “Wiring Diagrams” from the left-hand menu
- Choose the Year, Make, and Model
- Select a System (engine, ABS, HVAC, etc.)
- Click into your diagram to view full screen, zoom, or print
It takes less than a minute to get from login to live electrical data.
What’s Covered
Our wiring diagram library includes:
- Major systems: Engine, Aftertreatment, ABS, HVAC, Lighting, Body, Chassis, and Transmission
- Top OEMs like Freightliner, Peterbilt, Kenworth, Volvo, Mack, International, and more
- Engine platforms including Cummins, PACCAR, Detroit Diesel, Navistar, and others
- Diagrams built and verified by in-house Diesel Repair experts
Thousands of diagrams are added, updated, and standardized by our internal team—so you always have reliable, up-to-date info.
Built for Techs at Every Level
🔧These diagrams were built to help everyone in your shop—not just your most experienced technicians.
- Newer techs can follow a circuit with confidence
- Experienced techs solve problems faster and don’t get interrupted
- Foremen and leads aren’t constantly pulled into avoidable rewrites or rework
- Everyone gets the same clean, visual information—no matter the system or truck
No more guesswork. No more digging. Just answers.
Want to see how it works? Watch our walk through how to use Diesel Repair’s Wiring Diagrams and where it fits in your Diesel Repair workflow. Want to book a personalized Demo? Submit your information on our contact form and we’ll reach out to schedule a demo so we can show you Diesel Repair and answer any questions you have!
You’ll see how fast it is to search, view, and apply diagrams right inside your workflow.
Get Started for Free
You don’t need a subscription to access Diesel Repair’s Wiring Diagrams.
Just create a free account and start using them on your next job.
Want to dive deeper into wiring diagrams and how Diesel Repair can help? Check out these related blog posts:
🔧 Mack Truck Wiring Diagrams
A focused look at Mack’s wiring diagrams, layout tips, and how to navigate the system.
🧠 Wiring Diagrams: What You Need to Know
An overview of how Diesel Repair’s wiring diagrams work—and why they save you serious time.
🚚 Freightliner Wiring Diagrams
Need diagrams for a Freightliner? Here’s how to find exactly what you need in seconds.