Success: You have added Heavy Ranger® MUTT® 7-Way Round Pin Trailer Tester - Diagnostic Tool to your shopping cart!
The Heavy Ranger® MUTT® is a rugged, water-resistant trailer tester designed for commercial trailers with 7-way round pin connectors. It powers each trailer circuit—no truck required—to verify wiring configuration, ground integrity, short circuits, brake function, and turn signal operation.Built for reliability in shop or yard environments, this standalone unit speeds up diagnostics, prevents blown fuses, and eliminates guesswork. The internal battery compartment offers cordless operation (battery not included), while the external 12V port adds flexibility—serving as a memory saver, test light supply, or trickle charger input.Features and Benefits:Tests 7-way round pin trailer harnesses without connecting to a truckSimulates turn signals, brake lights, and 12V power for system verificationBuilt-in short circuit and overload protectionVisual LED confirms power output at each circuitRugged, water-resistant design for field or shop useInternal battery compartment (battery not included)
| Category | Tools > Electrical Tools > Other Electrical Tools |
|---|