Carol Stream, IL · Mon–Fri, 9am–4:30pm
(630) 520-0103 service@bigrigfixer.com
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Big Rig Fixer technician performing electrical repair

Electrical Repair

Keep Your Electrical Systems in Top Condition

Expert electrical repair services to ensure your trucks and trailers run smoothly.

Get Service Call (630) 520-0103

Electrical Issues, Solved End-To-End

Our electrical repair services include complete diagnostics, wiring repairs, component replacement, and routine maintenance. We ensure your electrical systems are functioning properly to keep your vehicles safe and efficient on the road.
Technician repairing truck wiring harness

Wiring & Circuit Repairs

From shorts and frayed harnesses to blown fuses and failed relays, our technicians trace and repair electrical faults quickly. We use manufacturer diagrams and test procedures to restore full functionality to lighting, sensors, charging, and control systems.

Common Electrical Repairs We Handle

We resolve power and signal issues in truck and trailer systems including:
  • No-start conditions and battery drain issues
  • Lighting failures: brake, turn, clearance, marker
  • Trailer plug & pigtail diagnostics
  • Ground faults and circuit overloads
  • Inverter and APU electrical issues
Truck electrical components including alternator, 7-way connector, and a clearance light
Technician replacing truck LED lighting

Comprehensive Lighting System Repairs

From headlights to DOT compliance lighting, we service all truck and trailer lighting systems. Our technicians diagnose and repair LED conversions, marker lights, clearance lights, brake lights, turn signals, hazard lights, and backup lights. We ensure your lighting meets DOT regulations and keeps you visible and compliant on the road.

Complete Electrical Solutions

  • Battery & Charging Systems

    Battery testing, replacement, alternator repair, and charging system diagnostics to keep your power systems reliable.

  • Lighting & DOT Compliance

    Complete lighting system repair including LED conversions, DOT-compliant marker lights, and safety lighting upgrades.

  • Wiring & Control Systems

    Complex wiring harness repair, ECM diagnostics, multiplex systems, and electronic control module programming.

  • Starter & Ignition Systems

    Starter motor repair and replacement, ignition switch diagnostics, and engine control system troubleshooting.

  • Trailer Electrical Systems

    7-way trailer connections, ABS wiring, lighting circuits, and refrigerated trailer electrical systems.

  • Auxiliary Power Units

    APU electrical system repair, inverter installation and service, and auxiliary power system troubleshooting.

Specialized Electrical Services

Advanced electrical repair capabilities for modern commercial vehicles:
  • LED lighting conversions and upgrades
  • Electronic control module (ECM) diagnostics
  • Multiplex wiring system troubleshooting
  • Dashboard and gauge cluster repair
  • Power window and door lock systems
  • Starting and charging system diagnostics
  • Fleet tracking system installation
  • Aftermarket electrical modifications
An Electrical harness

Give Intermittent Faults a History

Electrical concerns can change with moisture, temperature, vibration, or a particular tractor/trailer connection. Note the conditions rather than only the last component that stopped working. Include accessory installations, battery work, jump-starts, and earlier repairs that preceded the symptom.

A failed fuse is evidence of a circuit problem, not permission to fit a larger fuse. Do not bypass protection or keep replacing a fuse without investigation. Preserve fault messages and describe whether the concern affects starting, charging, lighting, or several systems at once.

  • Affected circuits and warning messages
  • Weather or connection patterns
  • Recent accessory and battery changes
Electrical Fault Reporting Guide

Power Problems? We've Got You.

Schedule your electrical diagnostics and let our experienced technicians get your systems powered, grounded, and road-ready.

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