7 Round Pin Tractor Trailer Circuit Tester

Part Number: 7000
Price: $32.02
Ships Direct From Manufacturer

Test Towing Circuits at the back of the truck

The 7 Round Pin Tractor Trailer Circuit Tester is designed to quickly test tractor and trailer lighting circuits. Simply plug it into the end of the cable nearest the trailer, bring the cable into the cab and run through each circuit of your lighting system. If one or more of the LEDs do not come on as its circuit is being checked, that circuit is faulty.


  • "One-man testing" for male and female 7-way round pin tractor trailer plugs
  • Plugs into the vehicle side socket
  • LEDs indicate that each circuit is working
  • Weatherproof
  • Winged grip for easy installation and removal
  • Allows bypassing of troubled circuitry while on the road
  • Packaged with brass jumper
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