Test Trailer Lights, Brakes & 12V Power Without a Truck

The #9101-D20C Light Ranger MUTT® Compatible with DeWalt® 20V Batteries is a portable, water-resistant trailer tester designed to test trailer lights, electric brakes, and 12V power without connecting the trailer to a tow vehicle.

Powered by a compatible DeWalt® 20V battery, the Light Ranger MUTT® simulates the electrical functions of a standard tow vehicle, providing a fast and convenient way to inspect and troubleshoot light-duty trailers in the field. Its integrated smart battery adapter helps stabilize current, protect against short circuits, and reduce the risk of blown fuses or premature battery depletion.

The standard 7-way spade (J2863) connector and included 3-way trailer adapter provide compatibility with a variety of common trailer connections, including 7-way flat, 6-way round, 5-pin, and 4-pin trailer plugs.

Portable Trailer Testing Without a Tow Vehicle

The Light Ranger MUTT® eliminates the need to connect a trailer to a truck when testing its electrical system. This makes trailer diagnostics faster and more convenient for technicians, trailer dealers, fleet operators, and trailer owners.

The compact, portable design allows you to test trailer electrical systems wherever the trailer is located, including service areas, parking lots, storage facilities, and job sites.

Test Trailer Lights, Electric Brakes & 12V Power

The Light Ranger MUTT® simulates essential trailer electrical circuits, allowing you to test:

• Running lights
• Turn signals
• Electric brakes
• 12V auxiliary power
• Trailer electrical circuits

It is designed for a wide range of light-duty trailers, including RVs, boat trailers, car haulers, landscape trailers, utility trailers, horse trailers, and work trailers.

Compatible with DeWalt® 20V Batteries

The #9101-D20C is designed to operate with DeWalt® 20V batteries, allowing technicians and trailer owners to use a familiar cordless battery platform to power their trailer tester.

The integrated battery adapter helps stabilize current flow while protecting the tester and battery from short-circuit conditions and excessive electrical loads. Efficient power management helps maximize battery runtime, allowing more trailer tests between battery charges.

Battery not included.

Important: The battery adapter is designed for the specified DeWalt® 20V battery platform and is not cross-compatible with other battery systems. Confirm compatibility with your specific battery model before use.

Built-In Short Circuit & Overload Protection

The Light Ranger MUTT® features protective circuitry designed to help safeguard the trailer, tester, and battery during electrical testing. An automatic-resetting thermal circuit breaker provides overload protection to help reduce the risk associated with short circuits and excessive current draw.

This helps eliminate the inconvenience and guesswork associated with repeatedly replacing blown vehicle fuses while troubleshooting trailer wiring.

Test Multiple Trailer Connector Types

The standard 7-way spade (J2863) connection and included 3-way trailer adapter allow the Light Ranger MUTT® to test several common trailer plug configurations:

• 7-way flat
• 6-way round
• 5-pin
• 4-pin

This makes the #9101-D20C a versatile trailer diagnostic tool for technicians and owners working with different trailer types and connector configurations.

Rugged & Portable Trailer Diagnostic Tool

Built for demanding shop and field environments, the Light Ranger MUTT® features rugged polypropylene and powder-coated steel construction and weighs just 2.5 lbs. empty.

Its water-resistant design provides added durability for mobile trailer testing, while the manual control knob provides straightforward operation and allows technicians to activate the circuits they need to test.

Light Ranger MUTT® #9101-D20C Specifications

A Faster Way to Test Trailer Electrical Systems

Connecting a trailer to a truck isn’t always convenient when you need to diagnose an electrical problem. The Light Ranger MUTT® #9101-D20C provides a portable alternative by simulating the tow vehicle and powering the trailer from a compatible DeWalt® 20V battery.

With multi-connector compatibility, built-in short-circuit and overload protection, rugged construction, and cordless battery-powered operation, it’s an effective solution for trailer light testing, electric brake testing, trailer electrical troubleshooting, and routine trailer inspections.

DEWALT® is a trademark of Stanley Black & Decker, Inc. Innovative Products of America®, Inc.
is not affiliated with, authorized by, endorsed by, or sponsored by Stanley Black & Decker. Use
of this adaptor is not endorsed by Stanely Black & Decker and may affect the battery or tool
warranty. Consult the battery manufacturer’s terms for details.