Complete Circuit Coverage
Tests turn signals, hazard lights, brake lights, clearance lights, tail lights, and ABS circuits in one compact tool.
- Free shipping
- 14-day easy returns
- Secure checkout
- Quality guaranteed
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Why customers love it
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
Why You'll Appreciate This Tester
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.
-
Connect
Connect it to the truck's 7-way round pin electrical connector.
-
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
Our worry-free shopping promise
If your order arrives damaged, defective, or not as described, contact us within 14 days and we will make it right with a replacement or refund.
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.
Shipping & returns
Shipping
- Delivers to United States (based on your selected country/region).
- Estimated delivery: 3–15 business days after dispatch.
- Shipping cost: Free.
Returns
You can request a return within 14 days after delivery. Standard returns have a €4.00 EUR (approximately $4.66 USD) flat-rate return shipping fee, deducted from your refund. Return shipping is free for items that arrived damaged, defective, or incorrect. Items should be unused and in original packaging where possible. Contact us before sending anything back.