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Test Your Electric Motor: Expert Tips - Bob Tusky's Best Appliance

How to test An Electric Motor: When it comes to troubleshooting electrical appliances, testing an electric motor is an essential skill. Whether you’re a DIY enthusiast or a professional technician, knowing how to test an electric motor can save you time and money. In this article, we will guide you through the process of testing an electric motor, using simple tools like a multimeter and addressing common concerns such as testing motor capacitors. So, let’s dive in and learn how to test an electric motor.

How to test an electric motor

Understanding Electric Motors

Before we jump into testing procedures, it’s important to have a basic understanding of electric motors. Electric motors are devices that convert electrical energy into mechanical energy, making them essential components in various appliances, machinery, and vehicles. They consist of a stator (stationary part) and a rotor (rotating part) and can be powered by alternating current (AC) or direct current (DC).

Safety Precautions

Safety should be your top priority when working with electric motors. Here are some crucial safety precautions to follow:

  • Always disconnect the power source before working on an electric motor.
  • Use appropriate personal protective equipment (PPE), including insulated gloves and safety glasses.
  • Make sure the motor and surrounding area are dry and free from any flammable materials.
  • Take extra caution when dealing with high-voltage motors or large machinery.

How To Test an Electric Motor with a Multimeter

A multimeter is a versatile tool that can help diagnose various issues in an electric motor. Follow these steps to test your electric motor using a multimeter:

  • Set the multimeter to the resistance (ohms) mode.
  • Ensure the motor is disconnected from any power source.
  • Locate the motor’s electrical terminals.
  • Touch the multimeter leads to the motor terminals.
  • A healthy motor will show a low resistance reading on the multimeter display.
  • If the resistance reading is extremely high or infinite, there may be an issue with the motor windings.

Identifying Motor Problems

Identifying motor problems is an important step in testing an electric motor. By recognizing common issues, you can diagnose and address them effectively. Here are some key motor problems to look out for:


If you notice excessive heat or a burning smell coming from the motor, it indicates an overheating problem. This could be caused by factors such as a faulty cooling system, inadequate ventilation, or an excessive load on the motor.

Noise and Vibration: 

Unusual noises, such as grinding, squealing, or knocking sounds, along with excessive vibration, can be signs of motor problems. These issues may arise from misalignment, worn-out bearings, or loose components.

Lack of Power: 

A motor that struggles to start or lacks power during operation may indicate underlying issues. This could be due to problems with the motor’s wiring, a faulty capacitor, or inadequate power supply.

Irregular Operation: 

If the motor stops unexpectedly, runs erratically, or exhibits inconsistent behavior, it suggests internal faults. These faults may stem from damaged windings, faulty electrical connections, or problems with the motor’s control circuitry.

Electrical Issues: 

Motor problems can also be caused by electrical faults, such as short circuits, ground faults, or open circuits. These issues can lead to abnormal motor behavior, including failure to start or irregular operation.

When testing an electric motor, carefully observe its performance and take note of any unusual signs or behaviors. Identifying motor problems accurately will help you determine the appropriate course of action, whether it’s performing further tests, repairing specific components, or seeking professional assistance.

How To Test An Electric Motor Capacitor

Motor capacitors play a crucial role in starting and running electric motors. Here’s how you can test a capacitor on an electric motor:

  • Discharge the capacitor by shorting its terminals with an insulated screwdriver.
  • Set the multimeter to the capacitance (F) mode.
  • Connect the multimeter leads to the capacitor terminals.
  • The multimeter should display a capacitance value close to the rated capacitance.
  • If the reading is significantly lower or higher than the rated capacitance, the capacitor may be faulty.

Troubleshooting Motor Capacitor Issues

If you suspect a problem with your motor’s capacitor, consider the following troubleshooting steps:

  • Check for physical damage or bulging in the capacitor casing.
  • Inspect the wiring connections to ensure they are secure and free from corrosion.
  • If the capacitor fails the capacitance test, replace it with a new one of the same rating.

Common Mistakes to Avoid

When testing electric motors, it’s crucial to avoid common mistakes that could lead to inaccurate results or further damage. Here are a few mistakes to steer clear of:

  • Forgetting to disconnect the power source before testing the motor.
  • Mishandling or misplacing the multimeter leads, leading to incorrect readings.
  • Neglecting to check the motor’s bearings and lubrication, which can affect performance.
  • Failing to consider other factors such as wiring issues or mechanical faults

Maintaining Electric Motors

Regular maintenance can prolong the lifespan and performance of your electric motor. Here are some tips for motor maintenance:

  • Keep the motor clean and free from dust or debris.
  • Lubricate the motor bearings according to the manufacturer’s recommendations.
  • Check and tighten any loose electrical connections.
  • Schedule periodic inspections and servicing by a professional technician.

Why We Choose Bob Tusky For Testing Electric Motor

Bob Tusky’s Best Appliance is a trusted brand in the industry, known for its high-quality products and reliable customer service. When it comes to testing an electric motor, choosing a reputable brand like Bob Tusky’s Best Appliance can offer several advantages.

Expertise and Experience:

Bob Tusky’s Best Appliance has years of experience in manufacturing and servicing appliances. Their expertise in the field ensures that their electric motors are designed to meet industry standards and deliver optimal performance.

Quality Assurance: 

Bob Tusky’s Best Appliance is committed to providing top-notch products. Their electric motors undergo rigorous testing and quality control measures to ensure durability and efficiency. By choosing their motors, you can have confidence in the quality and reliability of the product.


Bob Tusky’s Best Appliance electric motors are designed to be compatible with a wide range of appliances and machinery. Whether you’re working on a home appliance or a commercial system, their motors are engineered to fit seamlessly and function effectively.

Customer Support: 

In case you encounter any issues or have questions regarding the electric motor, Bob Tusky’s Best Appliance offers excellent customer support. Their team of professional technicians is available to assist you with troubleshooting, warranty claims, or any other concerns you may have.

Warranty Coverage: 

Bob Tusky’s Best Appliance stands behind their products and offers warranty coverage on their electric motors. They also provide electric motor repair service. Their service provides peace of mind, knowing that you’re protected against any potential defects or malfunctions. 


“How to test an electric motor” is a important question because testing an electric motor is a crucial step in troubleshooting issues and ensuring optimal performance. By following the outlined steps and safety precautions, you can diagnose problems accurately and take appropriate measures to resolve them. Remember to use a multimeter to test the motor’s resistance and capacitors, and pay attention to any signs of motor problems. With proper maintenance and care, your electric motor can serve you reliably for years to come.

If you have any further questions or need assistance, feel free to reach out to us. Our team at Bob Tusky’s Best Appliance is here to help. You can contact us.


Can I test an electric motor without a multimeter?

While a multimeter is the most accurate tool for testing electric motors, you can perform basic inspections for visible issues such as loose connections or physical damage.

What can cause an electric motor to overheat?

Common causes of motor overheating include excessive load, insufficient cooling, or problems with the motor’s ventilation system.

How often should I lubricate the motor bearings?

The frequency of lubrication depends on the motor’s usage and the manufacturer’s recommendations. As a general guideline, lubrication every six months is a good practice.

Is it possible to repair a faulty motor capacitor?

 No, motor capacitors are not repairable. If a capacitor fails, it must be replaced with a new one of the same rating.

Should I hire a professional technician to test my electric motor?

If you’re unsure or uncomfortable with testing an electric motor yourself, it’s always advisable to seek the assistance of a qualified technician to avoid any potential risks or errors.

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