Introduction
The DEWENWILS HGFB03D 3-foot Outdoor GFCI Extension Cord is designed to provide reliable power and enhanced safety for your electrical devices. Featuring a built-in Ground Fault Circuit Interrupter (GFCI), this heavy-duty cord offers protection against electrical shock and fire hazards, making it ideal for both indoor and outdoor applications. This manual provides essential information for the safe and effective use of your extension cord.

Image: The DEWENWILS 3-foot outdoor GFCI extension cord, showcasing its main components including the GFCI unit, the 3-prong plug, and the 3-way outlet.
Safety Information
Always prioritize safety when using electrical equipment. The built-in GFCI provides critical protection by quickly cutting off power in the event of a ground fault, significantly reducing the risk of electrical shock. Adhere to the following safety guidelines:
- Inspect the cord for any damage, cuts, or exposed wires before each use. Do not use if damaged.
- Ensure the plug is fully inserted into a compatible receptacle.
- Do not immerse the GFCI unit or any part of the cord in water.
- Keep children and pets away from the extension cord during operation.
- Always unplug the cord from the power source when not in use or before performing any maintenance.
- Do not overload the extension cord. Ensure the total wattage of connected devices does not exceed the cord's maximum rating.
Setup
The DEWENWILS GFCI extension cord is ready for use out of the box. Simply plug it into a standard 125V AC outlet. The pigtail plug features a clear design with an LED indicator that illuminates when power is supplied, confirming the cord is energized.
For replacement applications, the GFCI unit is designed for easy wiring. It includes various grommet sizes (18, 16, and 14 gauge) to ensure a secure, watertight seal for different wire thicknesses. The internal terminals are clearly marked for proper wire connection.

Image: A detailed view of the GFCI unit, highlighting the 'Test' and 'Reset' buttons for user interaction.
Operating Instructions
- Initial Connection: Plug the extension cord into a standard 125V AC outlet. The LED indicator on the pigtail plug will light up, indicating power is available.
- GFCI Test: Before each use, press the TEST button on the GFCI unit. The power should immediately cut off, and the LED indicator should turn off.
- GFCI Reset: If the power cuts off after testing or due to a ground fault, press the RESET button. The LED indicator should illuminate, and power will be restored. If power does not restore, or if the GFCI trips repeatedly, discontinue use and inspect your equipment for faults.
- Connecting Devices: Plug your electrical devices into the 3-way outlet. Ensure the total load does not exceed the cord's maximum wattage.

Image: The clear pigtail plug with an illuminated LED, indicating that the extension cord is receiving power.
Features
- Built-in GFCI Protection: Provides ground fault leakage protection within 13 inches of the plug, safeguarding users and electronic devices from electrical hazards.
- Heavy-Duty Construction: Features 12/3 SJTW gauge wire with thicker 600-volt insulation, rated for 15A/125V/1875W, suitable for demanding outdoor equipment.
- Manual Reset Function: Allows for quick restoration of power after a trip, with a clear warning to check equipment for safety before resetting.
- LED Lighted Plug: A clear, single-socket plug illuminates when energized, providing a visual power indicator, especially useful in low-light conditions.
- Weather-Resistant Jacket: The high-quality jacket protects against moisture, abrasion, and sunlight, ensuring reliable performance in temperatures from -40°F to 140°F.
- Versatile Use: Designed for both indoor and outdoor applications, compatible with power tools, lawn equipment, and other electrical devices.

Image: The robust construction of the extension cord, designed to withstand various weather conditions, including moisture.
Specifications
| Specification | Detail |
|---|---|
| Model Number | HGFB03D |
| Brand | DEWENWILS |
| Cord Length | 3 feet |
| Wire Gauge | 12/3 SJTW |
| Voltage Rating | 125 Volts |
| Current Rating | 15 Amps |
| Max Power Rating | 1875 Watts |
| Plug Format | Type B (3-prong) |
| Connector Gender | Male-to-Female |
| Color | Black |
| Item Weight | 13.8 ounces |
Maintenance
To ensure the longevity and safe operation of your DEWENWILS GFCI extension cord, follow these maintenance tips:
- Regularly inspect the cord, plug, and GFCI unit for any signs of wear, damage, or corrosion.
- Clean the cord and GFCI unit with a dry cloth. Do not use liquids or abrasive cleaners.
- Store the cord in a dry, cool place when not in use, away from direct sunlight and extreme temperatures.
- Avoid kinking or bending the cord sharply, as this can damage the internal wiring.
Troubleshooting
If your GFCI extension cord is not functioning as expected, consider the following:
- No Power / GFCI Tripped: If the LED indicator is off and no power is supplied, press the RESET button. If it immediately trips again, there may be a ground fault in the connected appliance or the cord itself. Disconnect all appliances and try resetting. If it still trips, the cord may be faulty.
- LED Indicator Not Lighting: Ensure the cord is securely plugged into a live outlet. If the outlet is working and the LED still doesn't light after pressing RESET, the cord may be damaged or the GFCI unit may be faulty.
- Intermittent Power: Check all connections for looseness. Inspect the cord for any visible damage that could cause intermittent contact.
If issues persist after troubleshooting, contact customer support.
Product Videos
12 Gauge GFCI Product Review
Video: A detailed review of a 12 gauge GFCI product, demonstrating its features and functionality. This video is provided by Watts Wire.
AIDA GFCI Adapter
Video: An overview of the AIDA GFCI Adapter, showcasing its design and how it provides ground fault protection. This video is provided by Electric4Pro.
Warranty and Support
This product comes with a three-year warranty. If it fails due to a manufacturing defect, return it with proof of purchase to DEWENWILS for a free replacement. This warranty is limited to the replacement of the product only during the noted period and no other warranty, liability, or responsibility is implied or expressed.
For further assistance or inquiries, please refer to the contact information provided with your purchase or visit the DEWENWILS official website.