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A black circuit tester with seven gold pins and a round LED indicator, used for testing trailer circuits.
Black 7-way round pin trailer circuit tester with multiple gold-tipped probes.
A black tool with a winged handle design showing seven gold-tipped pins for testing electrical circuits.
A close-up view of a professional design 7-way cable circuit tester with multiple colored pins being tested.
Diagram showing the dimensions of a 7-way round pin tractor trailer circuit tester and its connector.
A close-up view of a ProfessionalDesign 7-way round pin trailer circuit tester with various labeled pins.
A mounting position diagram showing a 7-way round pin trailer circuit tester for semi-trucks and its installation.
Diagram showing the dimensions of a 7-Way Round Pin Tractor Trailer circuit tester.
Three views of a 7-way round pin trailer circuit tester showing LED indicators, a winged handle, and seven corresponding hole
A black circuit tester with seven round pins is shown next to various trailer trucks and semi-trucks.
A black circuit tester with seven round gold pins and a yellow key is shown.
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7-Way Round Pin Trailer Circuit Tester for Semi-Trucks

Precio habitual $94.99 Precio de oferta $79.99

Por qué les encanta a los clientes

Pinpoint Trailer Electrical Faults in Seconds

This 7-way round pin circuit tester lets you quickly diagnose lighting and ABS issues on semi-trucks and tractor trailers by connecting directly to the vehicle's electrical connector.

  • Tests turn signals, hazard lights, brake lights, clearance lights, tail lights, and ABS circuits
  • LED indicators clearly show the status of each circuit for fast, accurate diagnostics
  • No batteries required—powered directly by the vehicle's electrical system
  • Durable metal and ABS construction built for frequent use in demanding environments
  • Ideal for owner-operators, fleet maintenance, and pre-trip or federal inspections
A black circuit tester with seven gold pins and a round LED indicator, used for testing trailer circuits.

Why You'll Appreciate This Tester

Complete Circuit Coverage

Tests turn signals, hazard lights, brake lights, clearance lights, tail lights, and ABS circuits in one compact tool.

Instant Visual Feedback

LED indicators clearly show the status of each circuit for fast, accurate diagnostics.

No Batteries Needed

Powered directly by the vehicle's electrical system, so it's always ready when you are.

Built for the Road

Durable metal and ABS construction built for frequent use in demanding environments.

Setup

How to Use

No electrician, no wiring, no fuss.

  1. Connect

    Connect it to the truck's 7-way round pin electrical connector.

  2. Test

    Use the function switches to check each circuit's condition via clear LED indicators.

Specs

The details that matter

Built to last outdoors, season after season.

Connector Type
7-way round pin
Compatibility
Semi-trucks and tractor trailers
Material
Metal and ABS
Power Source
Vehicle electrical system (no batteries required)
Package Type
Full Package

Nuestra promesa de compra sin preocupaciones

Si tu pedido llega dañado, defectuoso o distinto a lo descrito, contáctanos en un plazo de 14 días y lo solucionaremos con un reemplazo o un reembolso.

Frequently asked questions

Everything you might want to know before you order.

Which circuits does this tester check?

It tests turn signals, hazard lights, brake lights, clearance lights, tail lights, and ABS circuits.

What connector type is it compatible with?

It is compatible with 7-way round pin connectors on semi-trucks and tractor trailers.

Does it require batteries?

No batteries are required—it is powered directly by the vehicle's electrical system.

What is it made of?

It features durable metal and ABS construction built for frequent use in demanding environments.

Who is this tester ideal for?

It is ideal for owner-operators, fleet maintenance, and pre-trip or federal inspections.

Envíos y devoluciones

Envío

  • Envío a Estados Unidos (según el país/región seleccionado).
  • Entrega estimada: 3–15 días hábiles después del envío.
  • Coste de envío: Gratis.

Devoluciones

Puedes solicitar una devolución dentro de 14 días después de la entrega. Las devoluciones estándar tienen una tarifa plana de envío de 4,00 € EUR (aproximadamente 4,66 $ USD), descontada del reembolso. El envío de devolución es gratuito si el artículo llegó dañado, defectuoso o incorrecto. Los artículos deben estar sin usar y en su embalaje original cuando sea posible. Contáctanos antes de enviar nada.