About Our Heavy-Duty Diagnostics & Electrical Repair Services
Unlike old school diesels, newer models are full of electronics. They have a ton of sensors, huge computer units, and a crazy amount of wiring. This makes your diesel truck more prone to electrical issues. These issues can be quite complex, and often require hours' worth of troubleshooting. Our technicians here at Integrity Fleet Services are experts at tracing wire systems. Why stress over electrical issues when we can deal with them instead? Here at Integrity Fleet Services, we understand better than most that being off the road is a great way to lose money. As such, our processes are quick yet effective and will have you out in a jiffy.
Tell-Tale Symptoms of a Bad Electrical System
Components Not Operating Properly
Do you think you have an electrical issue? Are any of your electronic components not working? Common electrical issues include excessive dashboard lights, faulty gauges, and window actuators that don’t work. Since these issues could be caused by virtually anything, they can be quite difficult to troubleshoot. The problem could be anything from a blown fuse to a damaged wire harness. Here at Integrity Fleet Services, our technicians are wiring experts. With the tools and experience needed to get the job done as efficiently and effectively as possible, you can rest assured knowing that Integrity Fleet Services has your back.
Blown Fuses
Fuses are designed to protect your vehicle’s wiring by sacrificing themselves in the event that too much power goes through your system. Every fuse has its own rating, and when that rating is exceeded, the fuse will blow. Many assume that a blown fuse is the cause of all their issues, but electrical issues are often more complex than that. Something caused the fuse to blow, meaning replacing the fuse is not a permanent solution. You may get lucky and not notice the problem again for quite some time, but you run the risk of it showing up again.
Why Conroe Trusts Integrity Fleet Services for Diagnostics & Electrical Repair
Good diagnostics require experience, proper equipment, and technicians willing to verify the problem before recommending repairs. Integrity Fleet Services combines professional diagnostic resources with experienced commercial technicians who explain their findings clearly.
- Diagnostic experience with Class 3-8 commercial vehicles
- Professional software supports technicians during troubleshooting
- More than 20 years of truck and trailer industry experience
- Clear answers help customers make informed repair decisions
- Mobile and in-shop capabilities support continued troubleshooting when needed
Contact us Today
Are you having electrical problems? Give Integrity Fleet Services a call today.
FAQs
How Do You Get to Integrity Fleet Services in Conroe?
Integrity Fleet Services handles diagnostics and electrical repair from its shop at 13044 Highway 105 E, Conroe, TX 77306. Commercial vehicles traveling through Texas can approach the area by way of I-45, with Oklahoma drivers able to use I-35 southbound before transitioning toward I-45. Louisiana traffic can come west on I-10 into southeast Texas, continuing north toward the Conroe area.
As drivers make the final approach, Loop 336 provides a practical local route toward Highway 105. Across the road, Time to Spare Entertainment makes the shop easier to identify for first-time visitors. Fuel Maxx and Exxon are only around a minute from the facility, providing nearby fuel options around diagnostic and electrical service.
What are common signs of electrical problems in heavy-duty vehicles?
Signs include dim headlights, slow engine cranking, a glowing battery light, and malfunctioning accessories. Diagnosing these promptly can prevent major system failures.
What causes a heavy-duty truck battery to drain overnight?
Parasitic draws, faulty alternators, and malfunctioning control modules can drain your truck's battery while it’s off. Checking for current draw with a multimeter helps pinpoint the issue and prevent repeated battery failures.
Why do warning lights keep coming back on my diesel truck?
Recurring warning lights may indicate an active fault, intermittent electrical problem, sensor issue, wiring concern, or another system requiring further testing. Diesel diagnostics can read fault codes and operating data, but technicians may need additional electrical tests to confirm the underlying problem before making repairs.
What causes batteries to keep dying in a commercial truck?
Repeated battery failure can result from charging system problems, poor electrical connections, excessive electrical draw, damaged wiring, or batteries that can no longer hold a proper charge. Commercial truck electrical repair can test the batteries and related circuits to determine why the truck continues losing power.
Why does my heavy-duty truck have intermittent electrical problems?
Loose connections, damaged wiring, corrosion, failing electrical components, or circuit faults can cause problems that appear and disappear while a truck operates. Heavy-duty truck electrical diagnostics can test affected circuits and connections to trace intermittent faults that may be difficult to identify through a visual inspection.
Heavy-Duty Truck & Trailer repairs

Axle Repair
18-wheelers and other heavy-duty commercial vehicles require hefty axles in order to mitigate the strain of intense torque. Light-duty axles on a heavy-duty rig would likely snap, as the force they’d be under would be nearly unfathomable. Whether through age, use, or exposure to the elements, axles need to be serviced routinely. Here at Integrity Fleet Services, we consider ourselves to be axle experts. Our skilled technicians are well-equipped to handle any and all axle problems.

Body Work
Your heavy-duty vehicle’s body work is responsible for maintaining adequate aerodynamics, benefits your fuel efficiency, and protects your engine and other vital components. It also maintains the look and aesthetics of your vehicle! Here at Integrity Fleet Services, we offer an all-encompassing set of body services. Whether you got into an accident or simply want custom work, our highly trained bodywork professionals will get the job done.

Brake Repair
Heavy-duty commercial vehicles can carry or tow close to a hundred thousand pounds because of their powerful engine and strong drivetrain. Bringing a hundred thousand pounds to a stop requires a hefty amount of braking power, and as such, heavy-duty commercial rigs will generally have incredibly complex and powerful braking systems. Because of what heavy-duty air brakes do on a regular basis, they require significant repair and maintenance.

Coolant System Repair
All vehicles that use an internal combustion engine will use some sort of coolant system. Heavy-duty coolant systems are usually a lot larger and a lot more complicated than what you’d normally find in a small or even medium-sized automobile. Ultra heavy-duty radiators and large coolant line systems are designed to handle an incredible amount of heat produced by large diesel engines. Heavy-duty trucks would catastrophically fail without their coolant system, so maintenance is mandatory.

Diagnostics & Electrical Repair
Newer diesel models are full of electronics. They have a ton of sensors, huge computer units, and a crazy amount of wiring. This makes your diesel truck more prone to electrical issues. These issues can be quite complex, and often require hours' worth of troubleshooting. Computer diagnostic service is the process of connecting your equipment to our state-of-the-art diagnostic equipment and running tests. This allows us to quickly and accurately diagnose and repair your equipment the right way the first time.

DOT Inspection
If your heavy-duty commercial vehicle weighs more than 10,000 pounds, the US Department of Transportation requires you to obtain a DOT inspection certificate on an annual basis. Our technicians at Integrity Fleet Services can perform both State and Federal DOT compliant inspections. Besides ensuring your truck is safe and in peak operating shape, our DOT compliant inspection service will keep you fully compliant with the Department of Transportations rules and regulations.

Driveline Repair & Maintenance
Your driveline is responsible for taking your engine’s torque and transferring it to your wheels. This is typically done using a series of driveshafts and differentials. These components need to be maintained on a routine basis because replacing them altogether can be extremely expensive. One of the major component types in your driveline are your differentials. Your differentials take power from your driveshaft and transfer it to your drive axles. Here at Integrity Fleet Services, we offer an extensive selection of driveline repair and maintenance services.

Exhaust System Repair
Exhaust systems are very important for heavy-duty 18-wheelers, for the bigger the engine, the more emissions. Alongside noise suppression, exhaust systems are also designed to protect the driver from harmful fumes and protect our atmosphere and environment. Using catalytic converters and other emissions control systems, your exhaust limits the amount of carbon that’s emitted into the atmosphere. Here at Integrity Fleet Services, we are exhaust experts.

Express Lube
If you want your heavy-duty commercial vehicle to last a long time, you need to perform adequate preventative maintenance. Here at Integrity Fleet Services, we offer a service called Express Lube. This service will ensure everything from 18-wheelers to lighter-duty haulers receives adequate maintenance in a proactive way. Our techs here at Integrity Fleet Services believe that proactive maintenance is far more beneficial to you as the driver than that reactive repairs.

HVAC Maintenance & Repair
As an 18-wheeler operator, you’re expected to drive in all types of weather. Whether you’re driving through the hot southern states or the cold Canadian provinces, you need a fully functioning HVAC system to keep you comfortable and safe. Here at Integrity Fleet Services, we consider ourselves to be HVAC experts. We have tons of experience working on AC and heating systems, and hundreds of happy customers to match.

Oil & Fluid
For your major components to work properly and last a long time, you need to perform preventative maintenance on a routine basis. This preventative maintenance starts with regular oil and fluid changes. Here at Integrity Fleet Services, we are preventative maintenance experts. We know the ins and outs of 18-wheelers better than anyone. We’ll have your oil and fluid maintenance done in a jiffy so you can get back out on the road.

Suspension Maintenance & Repair
Your suspension is an extremely important part of your 18-wheeler. Not only is it responsible for holding up extreme amounts of weight, but it’s also responsible for keeping you and your passengers safe. Unlike smaller cars, 18-wheelers use complex air suspension systems. These systems are designed to give you the strength of leaf spring setups and allow for comfort when not hauling. They can be complex, and as such, require routine maintenance and inspection.

Transmission & Clutch Repair
Your transmission and clutch are incredibly important. They allow your engine’s power to be transferred to your drivetrain using a variety of gears. These gears optimize your engine’s power input so you can haul extreme amounts of weight with relative ease. Here at Integrity Fleet Services, we’re experts at maintaining transmissions, but we are also fully equipped to do any and all transmission repairs that come our way.

Wheel & Tire Repair
18-wheeler operators drive hundreds of thousands of miles throughout their careers. They travel vast distances in all types of weather, in all climate types. Over time, drivers are bound to experience some sort of tire damage. The most common form is a tire blowout due to road debris. Here at Integrity Fleet Services, we offer a full suite of tire repair options. Whether you want your tire simply repair or completely replaced, our technicians have your back.
Need service?
Whether you’re broken down or planning ahead, we’re ready to help—roadside, mobile, or in-shop. We provide heavy-duty truck and trailer repair, fleet maintenance, and equipment service across Texas, Louisiana, Oklahoma, and surrounding areas.
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