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

The #9101-18C Light Ranger MUTT® Compatible with Milwaukee® M18® Batteries is a portable, water-resistant trailer tester designed to test trailer lights, brakes, and 12V power without connecting the trailer to a tow vehicle.

Using a compatible Milwaukee® M18® 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 built-in smart adapter system helps stabilize current, protect against short circuits, and reduce the risk of blown fuses or battery damage.

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 just to diagnose its electrical system. Its compact, rugged design makes it ideal for technicians, trailer dealers, fleet operators, and trailer owners who need a convenient testing solution.

Test trailer electrical functions wherever the trailer is located, including in a parking lot, service area, storage facility, or job site.

Test Multiple Trailer Electrical Functions

The Light Ranger MUTT® can simulate and test essential trailer circuits, including:

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

The tester is suitable 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 Milwaukee® M18® Batteries

The #9101-18C is designed for use with Milwaukee® M18® batteries, allowing technicians to power their trailer tester using a common battery platform.

The integrated battery adapter is designed to stabilize current flow while helping protect the battery and tester from short-circuit conditions and excessive electrical loads. Improved efficiency helps maximize battery runtime so you can perform more trailer tests between charges.

Battery not included.

Important: The battery adapter is designed for the specified Milwaukee® M18® 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® incorporates protective circuitry designed to help prevent electrical damage during trailer testing. An automatic-resetting thermal circuit breaker provides overload protection, helping reduce the risk associated with short circuits and excessive current draw.

This protection helps eliminate the need for repeatedly replacing blown vehicle fuses during trailer troubleshooting.

Test Multiple Trailer Connector Types

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

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

This versatility makes it a practical trailer diagnostic tool for service departments, technicians, trailer dealers, and owners working with different trailer types.

Rugged, Portable Trailer Diagnostic Tool

Built for field use, the Light Ranger MUTT® features a rugged polypropylene and powder-coated steel construction and weighs just 2.5 lbs. empty. Its water-resistant design makes it well suited for demanding shop and field environments.

The manual control knob provides straightforward operation, allowing technicians to quickly activate the trailer circuits they need to test.

Light Ranger MUTT® #9101-18C Specifications

A Convenient Alternative to Truck-Based Trailer Testing

When you need to diagnose trailer lighting and electrical problems, connecting the trailer to a truck isn’t always practical. The Light Ranger MUTT® #9101-18C provides a portable alternative by simulating the tow vehicle and powering the trailer from a compatible Milwaukee® M18® battery.

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

MILWAUKEE® and M18® are trademarks of Milwaukee Electric Tool Corporation. Innovative Products of America®, Inc.
is not affiliated with, authorized by, endorsed by, or sponsored by Milwaukee. Use of this adaptor is not endorsed by
Milwaukee and may affect the battery or tool warranty. Consult the battery manufacturer’s terms for details.