When your Diesel Generators starts producing low voltage, it can cause serious interruptions, whether you rely on it for industrial operations, commercial facilities, or as a reliable power source during outages. Troubleshooting this issue quickly helps prevent downtime and ensures your equipment runs at peak efficiency.
In this guide, we’ll walk through the common causes of low voltage in diesel fueled generators and practical troubleshooting steps to restore stable power.
Common Causes of Low Voltage in Diesel Generators
- Worn or Loose Connections
Loose wires, corroded terminals, or faulty connections in the generator’s electrical system can lead to voltage drops. - Excitation System Issues
Problems in the excitation circuit—such as a failed automatic voltage regulator (AVR) or weak field windings—can prevent the generator from building sufficient voltage. - Low Engine Speed
A generator’s output voltage is directly related to its engine speed. If the engine runs slower than designed, voltage output decreases. - Faulty Voltage Regulator
The AVR controls and stabilizes the generator’s output voltage. A malfunctioning AVR often results in fluctuating or consistently low voltage. - Overloaded Diesel Generators
Running too many appliances or equipment on a generator can overload it, leading to voltage drops and poor performance.
Troubleshooting Steps for Low Voltage
- Check Electrical Connections
Inspect all cables, terminals, and circuit breakers for loose or corroded connections. Tightening and cleaning can often resolve minor voltage issues. - Inspect the AVR
If the automatic voltage regulator is faulty, replacing it is often the fastest fix to restore normal voltage output. - Verify Engine RPM
Ensure the engine is running at the recommended speed (usually 1500 or 1800 RPM, depending on design). A tachometer can help confirm this. - Reduce Load
Disconnect excess equipment or appliances and test if the Diesel Generators returns to stable voltage. - Perform Routine Maintenance
Regular oil changes, fuel filter replacements, and engine tune-ups can help maintain proper performance and avoid voltage irregularities.
Choosing the Right Generator for Reliable Performance
If your generator frequently struggles with low voltage or requires costly repairs, it may be time to consider an upgrade. At BC Generators, we offer a wide selection of high-quality options to suit your needs, including:
- Generator for sale – Browse new models built for durability and long-term performance.
- Used generator for sale – Cost-effective solutions that deliver reliable power.
- CAT generators – Renowned for strength and efficiency in heavy-duty applications.
- Cummins generator Canada – Trusted worldwide for dependable backup power.
- Standby generator Canada – Perfect for residential and commercial properties during outages.
- Backup generator Canada – Ensures continuous power for critical systems when you need it most.
Final Thoughts
Low voltage in a Diesel Generators is a common but solvable issue. By checking connections, inspecting the AVR, monitoring engine speed, and reducing load, you can often restore proper function. However, if your generator continues to underperform, investing in a reliable replacement—such as diesel fueled generators from BC Generators—ensures uninterrupted power and long-term peace of mind.
