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  • The first step is to identify the symptoms reported by the vehicle owner. This may include issues like difficulty starting the engine, dimming headlights, warning lights on the dashboard, or non-functioning electrical accessories.

Symptom Identification:

  • A visual inspection of the battery, wiring, fuses, and other components is performed to identify obvious issues such as loose connections, damaged wiring, or corroded terminals.

Visual Inspection:

  • The battery is tested to ensure it has sufficient voltage and amperage. A weak or faulty battery can cause various electrical issues.

Battery Testing:

  • The alternator and charging system are tested to ensure they are supplying the right amount of power to recharge the battery and power electrical components.

Charging System Test:

  • The starter motor is tested to ensure it is engaging and turning the engine over properly.

Starter Motor Testing:

  • OBD scanners can also provide live data, allowing diagnostic scan tools to be connected to the vehicle's onboard diagnostic (OBD-II) system to retrieve trouble codes and additional information about engine and system technicians to monitor real-time sensor readings. Freeze frame data, which captures sensor data at the time a DTC is triggered, helps diagnose intermittent issues.

Scan Tool Diagnosis:

  • Individual electrical components, such as sensors, ignition system components, relays, and switches, may be tested using specialized tools and procedures.

Component-Specific Testing:

  • The wiring harness is inspected for damage, corrosion, or breaks that may be causing electrical issues.

Wiring Inspection:

  • Fuses and relays are checked to ensure they are intact and functioning. Faulty fuses or relays can disrupt electrical circuits.

Fuse and Relay Checks:

  • Voltage drop tests may be conducted to identify high-resistance areas in the electrical system, which can cause issues such as dimming lights or slow cranking.

Voltage Drop Testing:

  • Once the issue is identified, repairs may involve fixing or replacing faulty components, repairing wiring, or addressing issues with connectors and terminals.

Repair or Replacement:

  • After repairs, the vehicle is reassembled, and comprehensive testing is conducted to ensure that the electrical system functions correctly.

Reassembly and Testing:

Electrical System Diagnosis and Repair :

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