Smart MUTT® Series

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The Smart MUTT® is a Portable Trailer Light Tester for the Mobile and Commercial Trailer Repair Technician

Built to facilitate a one-man testing operation, the Smart MUTT® reduces guesswork and inspection time to prevent electrical failures that lead to expensive road calls and citations. This series offers three styles: the #9004M units are designed to be used on 7-way flat (spade), 6-way round, and 4/5 pin trailer connections, the #9007A/M units are designed to be used on 7-way round pin trailer connections, and the new #4105 units are universal and can be used on 7-way flat (spade), 7-way round, 6-way round and 4/5pin connections.

Features and Benefits:


  • Power lights and electric brakes: Manually, All-On, Auto Scan, or by Remote Control from over 200 ft. away
  • Audible and visual alerts: cross, open, overloaded and short circuit indication
  • Trailer wiring and circuit testing
  • Diagnostic Pulsar® mode allows safe overloaded/short circuit repair
  • Amperage readout and range (-/ 20 amp range)
  • Remote control allows for one-man testing


  • 12-button remote controls test all trailer electric circuitry and air brake actuation, 200 ft. range
  • Sync multiple (12) remotes to one unit
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