Dunarri TEDS Pro (Trailer Electrical System Tester)

Q: Does TEDS PRO work with a standard 7-way RV connector?

Yes — it’s designed around the common 7-way RV style connector, and adapters can be used for other plug types.

Q: What does the Auto-Test switch do?

Auto Test Mode is an exclusive feature that automatically cycles through the lighting circuits every few seconds (left turn, right turn, running, and reverse/backup). This allows true one-person testing without walking back and forth to operate vehicle switches.

Details

High Demand Notice: TEDS Pro is currently about 7 days out on shipping.

Professional-grade trailer electrical testing

TEDS PRO^™

Trailer Electrical System Tester

In Stock • Ships from Denver, CO

L

Load-Simulated Testing

Real draw

W

Waterproof Case

Shop ready

A

Auto Test Mode

Fast cycles

V

Amp / Volt Display

Instant read

Watch It In Action

TEDS Pro Overview

Trailer Testing Demo

Key Features

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20A Load Capacity
Simulates real-world draw

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Digital Amp / Volt Meter
Instant readout

•

100% Waterproof Case
Built for shops + field

•

Auto Test Mode
Fast cycling checks

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Brake & Signal Simulation
Verify circuits quickly

•

Reverse Polarity Protection
Built-in safety

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Multiple Power Options
Flexible setups

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Made in the USA
Quality build

Trusted by ProfessionalsShop + fleet tested

3 Year WarrantyBacked by Dunarri

Made in USABuilt to last

Perfect For

Repair Shops

Fleet Maintenance

Pre-Trip Inspections

Pro-Grade Testing. Real Load. Real Answers.

TEDS PRO is a professional trailer electrical system tester built for technicians, serious DIY owners, and high-throughput shops that need fast, repeatable diagnostics—without guesswork. Verify every circuit, confirm power delivery under load, and isolate wiring issues in minutes instead of chasing ghosts with a meter.

What Makes It “Pro”

This trailer wiring diagnostic tool is designed for real-world troubleshooting: stronger load testing, clearer feedback, and an interface that makes it easier to pinpoint weak grounds, corroded connections, damaged wiring, failing components, and intermittent issues that only appear under load (or when multiple functions are active).

Built for Shops & Real Work

Rugged case. Protection systems. Designed and assembled in Denver, CO. Whether you’re diagnosing brake circuits, lighting faults, plug/adapter problems, or “it works sometimes” gremlins, TEDS PRO turns trailer electrical testing into a quick, confident checklist.

OEM-Grade Trailer Connector

TEDS PRO uses a genuine POLLAK^® or CURT^® 7-way / 4-way combination connector—the same OEM connector that comes on most new trucks. Unlike many imported testers that use low-cost generic connectors, TEDS PRO is built with premium components designed for a secure fit, dependable electrical contact, and years of reliable service in professional shop and field environments.

Common Problems It Helps You Solve

Brake circuits popping fuses or underperforming under load
Turn signals / running lights that are dim, intermittent, or dead
Bad grounds, corroded pins, or voltage drop through wiring
Miswired adapters, 7-way connector issues, and plug fitment problems

FAQ

Does TEDS PRO work with a standard 7-way RV connector?

Yes — TEDS PRO uses a genuine POLLAK® or CURT® OEM-style 7-way RV / 4-way flat combination connector, allowing the vast majority of RV, utility, cargo, and equipment trailers to plug directly into the tester without adapters. Additional adapters are available for other trailer connector styles.

What does the Auto-Test switch do?

Auto Test Mode is an exclusive feature and a major reason many shops choose this unit. When enabled, TEDS PRO automatically cycles through the lighting circuits every few seconds (left turn, right turn, running, and reverse/backup). This allows true one-person testing without walking back and forth to operate vehicle switches.

Why does load-simulated testing matter?

Some trailer faults only show up when a circuit is actually drawing current. Load simulation helps reveal weak grounds, corroded connections, and voltage drop that a simple “no-load” test can miss.

Can I use it for brake diagnostics?

Yes — brake circuits are one of the most common places where real-load testing saves time, especially on multi-axle setups where combined draw can expose wiring or connection issues.

Is it shop-safe and field-safe?

The unit is built into a rugged waterproof case and includes protective features (like reverse polarity protection) to make it practical for daily use.