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

The #9102-D20C Heavy Ranger® MUTT® Compatible with DeWalt® 20V Batteries is a portable, water-resistant trailer tester designed specifically for commercial trailers with 7-way round pin (J560) wiring. It allows technicians to test trailer electrical systems without connecting the trailer to a truck, providing a faster and more convenient way to diagnose wiring and electrical problems.

Powered by a compatible DeWalt® 20V battery, the Heavy Ranger® MUTT® simulates the towing circuitry of a truck, allowing you to quickly test trailer lights, electric brakes, turn signals, 12V power, wiring configuration, and ground integrity.

Its patent-pending smart adapter system helps stabilize current and provides protection against short circuits, excessive loads, and premature battery depletion—helping prevent blown fuses and eliminating guesswork during trailer diagnostics.

Portable Commercial Trailer Testing Without a Truck

The Heavy Ranger® MUTT® eliminates the need to connect a commercial trailer to a tow vehicle simply to test its electrical system. This standalone tester gives technicians a portable solution for troubleshooting and routine inspections in the shop, parking lot, service area, or field.

Designed for commercial trailers using J560 7-way round-pin connections, the Heavy Ranger® MUTT® makes it easier to identify electrical problems before putting the trailer into service.

Test Trailer Lights, Electric Brakes & 12V Power

The Heavy Ranger® MUTT® simulates essential tow-vehicle electrical functions, allowing technicians to test:

• Running lights
• Turn signals
• Electric brakes
• 12V power
• Trailer wiring configuration
• Ground integrity
• Short circuits
• Brake function

By providing the necessary towing circuitry without a truck, the Heavy Ranger® MUTT® helps technicians quickly isolate trailer electrical issues and verify proper operation.

Designed for Commercial Trailers with J560 Wiring

Unlike general-purpose trailer testers, the Heavy Ranger® MUTT® #9102-D20C is built specifically for commercial trailers equipped with a 7-way round pin J560 trailer harness.

The J560 connection is commonly used on heavy-duty and commercial trailer applications, making this tester a practical diagnostic tool for technicians servicing commercial trailer fleets and equipment.

Compatible with DeWalt® 20V Batteries

The #9102-D20C is designed to operate using DeWalt® 20V batteries, providing convenient cordless power for mobile trailer testing.

Its integrated smart battery adapter helps stabilize current flow while protecting the trailer, tester, and battery from short-circuit damage and excessive electrical loads. Efficient power management helps extend battery runtime, allowing technicians to perform more tests between 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 Heavy Ranger® MUTT® features built-in protection designed to help safeguard the trailer’s electrical system and the testing equipment during diagnostics.

An automatic-resetting thermal circuit breaker provides overload protection, helping reduce the risk associated with short circuits and excessive current draw.

This protection helps technicians test trailer circuits without the inconvenience and guesswork associated with blown vehicle fuses.

Rugged & Portable Trailer Diagnostic Tool

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

The water-resistant design provides added durability for mobile trailer diagnostics, while the manual control knob provides simple, straightforward operation.

Its standalone design means there is no need to transport or position a truck alongside the trailer just to perform basic electrical testing.

Heavy Ranger® MUTT® #9102-D20C Specifications

A Faster Way to Diagnose Commercial Trailer Electrical Problems

The Heavy Ranger® MUTT® #9102-D20C provides a convenient way to test commercial trailer electrical systems without connecting the trailer to a truck. By simulating the truck’s towing circuitry, technicians can quickly verify trailer wiring, ground integrity, lights, turn signals, electric brakes, 12V power, and short circuits.

With a rugged, water-resistant design, cordless DeWalt® 20V battery operation, built-in electrical protection, and compatibility with 7-way round pin J560 trailer harnesses, the Heavy Ranger® MUTT® is a practical solution for commercial trailer diagnostics, maintenance, and 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.