Electrical & Lighting Repair
Full electrical diagnostics and lighting repairs to keep you visible and legal.
Modern trucks depend on complex electrical systems. From simple lighting repairs to advanced diagnostic work, our technicians troubleshoot and repair electrical issues efficiently. We ensure your truck meets all DOT lighting requirements and operates safely.
Modern commercial trucks rely on complex electrical systems that control everything from engine management and emissions to lighting, telematics, and driver safety features. A failed alternator can leave you stranded with dead batteries, a faulty ABS module can trigger a DOT violation, and a wiring harness short can cause intermittent problems that are maddening to track down. Weldon's Truck & Trailer provides complete electrical and lighting repair for Class 8 semi trucks and trailers from our Kingman, AZ base, with mobile service across a 200-mile radius on I-40, US-93, and surrounding highways. Our ASE certified technicians use factory-level diagnostic tools to troubleshoot ECM codes, ABS faults, ELD communication errors, and electrical failures quickly and accurately—on-site at your location.
Detailed Electrical & Lighting Services
Our electrical services cover the full range of commercial truck and trailer electrical systems. We diagnose and repair alternator failures, starter motor issues, voltage regulator problems, and battery drain including parasitic drain testing to identify circuits that kill batteries overnight. Our technicians troubleshoot ECM (engine control module) fault codes on all major engine platforms, diagnose TCM (transmission control module) errors, ABS module failures, and resolve ELD communication and power issues. Wiring harness and chassis wiring repair is a specialty—we trace ground faults, repair chafed wires, replace corroded connectors, and fix damaged circuits throughout the truck and trailer. We service fuse panels, circuit breakers, relays, and solenoids in the power distribution system. For lighting, we handle headlights, tail lights, marker lights, clearance lights, turn signals, and brake lights to ensure full DOT lighting requirements compliance, ICC marking visibility, and LED conversion upgrades. We repair and replace trailer pigtails, 7-way connectors, J560 connector assemblies, and ABS power line wiring to ensure reliable tractor-to-trailer electrical connections.
What's Included
Common Electrical & Lighting Problems We Fix
The most frequent electrical issues we encounter include dead batteries caused by failing alternators or parasitic drain from aftermarket accessories, no-start conditions from worn starter motors or corroded battery cables, and intermittent electrical faults caused by damaged wiring harnesses chafing against frame rails. ABS module failures and wheel speed sensor faults are common DOT inspection failures. On the lighting side, burned-out marker lights, broken tail light lenses, and corroded trailer pigtail connections are the leading causes of DOT lighting violations. We also see frequent issues with 7-way connector pins that cause intermittent trailer brake and light failures. Our technicians carry multimeters, circuit testers, and factory diagnostic scanners to trace these problems efficiently.
Why Choose Weldon's Truck & Trailer
Electrical troubleshooting requires systematic diagnosis, not guesswork. Weldon's technicians follow a logical diagnostic process using professional-grade tools to identify the root cause of electrical problems, not just replace parts until something works. We carry common electrical components—alternators, starters, batteries, wiring connectors, and lighting—on our service trucks for fast repairs. Every repair is tested and verified before we leave, and we document all work for your fleet records and DOT lighting compliance.
Our Electrical Repair Process
- 1Call (334) 759-7020 and describe the electrical issue—dead batteries, no start, warning lights, lighting violations, or intermittent faults.
- 2A technician arrives with diagnostic tools and common electrical components to handle most repairs on the first visit.
- 3We perform systematic electrical testing to isolate the root cause, then provide a clear diagnosis and repair estimate.
- 4Repairs are completed on-site—alternator replacement, wiring repair, lighting installation, or ECM diagnostics—and every circuit is tested for proper function.
- 5A final inspection verifies all systems are operating correctly and all lighting meets DOT requirements.
Service Area & Response Times
Our electrical and lighting repair service covers a 200-mile radius from Kingman, AZ. We carry alternators, starters, batteries, and lighting components on our service trucks and regularly perform mobile electrical repairs along I-40, US-93, I-15, and throughout Arizona, Nevada, and California.
"Joshua is amazing! Our RV broke down. He came out promptly and got us on the road again. He is extremely knowledgeable and helpful. A wonderful RV repairman!"