Truck Diagnostics & Electrical Repair Services in Seguin, TX

Semi Truck Electrical Repair in Seguin, TX

Modern diesel trucks rely heavily on complex electrical systems—from start-up to lighting, sensors, and in-cab electronics. When these systems fail, it can leave you sidelined. That’s why H&H Diesel Service offers full-scope semi truck electrical repair and truck diagnostics designed to locate and resolve issues fast.

We provide:

• Complete truck diagnostics using the latest diagnostic scanner tools
• Battery repair and testing
• Alternator repair and replacement
• Starter motor repair
• Lighting system repairs (headlights, brake lights, trailer plugs)
• Wiring harness diagnostics and replacement
• ECM/ECU fault code reading and clearing
• Electrical troubleshooting and rewiring services

If your truck is showing electrical warnings, draining batteries, or not starting, it’s time for a full diesel truck diagnostic. Our team reads and interprets data from your truck’s fault code reader—no guesswork, just precision. The sooner we catch an issue, the less downtime and damage you’ll face.

Experience the H&H Difference

Rapid Turnaround When You Need It Most: You’re not stuck waiting days for answers. With 6 service bays and 8 techs, we tackle electrical problems fast—without compromising quality.

Certified Techs With Advanced Equipment: You get results from trained professionals using state-of-the-art diagnostic gear. Our techs are certified in PACCAR, Terex, Kubota, and more.

Straightforward Service With Zero Guessing: You’ll know exactly what’s wrong and how we’ll fix it. We provide clear quotes and transparent timelines so you’re always in control.

Warranty-Backed Repairs: Our work is covered by a 30-day workmanship warranty, plus all applicable parts warranties—so you drive away with total confidence.

Mobile Repairs: Can’t make it to the shop? We offer dependable roadside assistance and scheduled mobile repairs to a 25-mile radius of Seguin, TX.

Contact Us About Truck Electrical Repair Now: Call 210-332-5821!

Your truck’s electrical system is too important to leave to chance. Call 210-332-5821 today and let our certified techs bring clarity to your codes, power to your systems, and dependability back to your rig. With H&H Diesel Service, you’re never left in the dark.

FAQs

What Areas Do You Serve for Heavy-Duty Diagnostic and Electrical Repair?

We’re based at 7310 I-10 West, Seguin, TX 78155, near the I-10 intersection. We also proudly serve San Antonio, TX; Lockhart, TX; Luling, TX; New Braunfels, TX; San Marcos, TX; Cibolo, TX; Schertz, TX; Marion, TX; McQueeney, TX; Geronimo, TX; New Berlin, TX; Santa Clara, TX; and Lake Dunlap, TX.

Can Electrical Wiring Be Repaired?

Signs of a bad alternator in heavy-duty diesel vehicles include dim or flickering lights, dead batteries, electrical failures, warning lights on the dashboard, and unusual noises like whining or grinding. If not addressed promptly, it can lead to total electrical system failure and vehicle breakdown.

What Are Signs of a Bad Alternator?

Yes, electrical wiring in heavy-duty diesel vehicles can be repaired using proper techniques such as soldering, crimping, or using heat-shrink connectors. Damaged sections should be replaced or securely reconnected to ensure safety and reliability. Repairs must meet industry standards to prevent shorts or system failures.

How Can I Get Heavy-Duty Diagnostic and Electrical Repair?

Just call 210-332-5821 now. We’ll run a full diagnostic, find the problem, and get you back on the road with a reliable, safe truck you can count on.