10
10A Load Testing
Breaker protected
TEDS (Trailer Light & Electrical System Tester)
Simple, rugged trailer electrical testing
TEDS™
Trailer Electrical System Tester
In Stock • Ships from Denver, CO
Watch It In Action
YouTube
Watch
Watch on YouTube
Durability Demo
Opens on YouTube
Durability Demo
Key Features
•
10A Max Load
Circuit breaker protected
Circuit breaker protected
•
Rotary Function Selector
Simple, fast checks
Simple, fast checks
•
Waterproof Case
Waterproof when latched
Waterproof when latched
•
7-Way RV Blade Plug
Plus 4-way flat adapter included
Plus 4-way flat adapter included
•
Reverse Polarity Protection
Built-in safety
Built-in safety
•
Trailer Battery Backfeed Protection
Protects your tester
Protects your tester
•
Tool Battery Options
Milwaukee / DeWalt capable
Milwaukee / DeWalt capable
•
Made in Denver, CO
Built in the USA
Built in the USA
Built for Real UseDurable, shop-ready case
24 Month WarrantyBacked by Dunarri
Made in Denver, COUSA built
Perfect For
DIY Trailer Owners
Small Shops
Pre-Trip Checks
Fast, No-Guesswork Trailer Electrical Testing
TEDS is a rugged trailer electrical system tester designed to make wiring checks quick and repeatable. No crawling under trailers, no probing pins with a multimeter, and no second-guessing whether a circuit is actually working. Plug it in, select a function, and verify lights and power in seconds.
How It Works
Connect TEDS to your trailer’s 7-way RV blade plug, rotate the selector to the circuit you want to test, and confirm the function. The built-in breaker enables safe load testing up to 10 amps—helpful for revealing issues that don’t show up with “no-load” testers.
Built for Real-World Use
Housed in a rugged waterproof case and designed with multiple protection systems, TEDS is made for garages, driveways, and job sites alike. Whether you’re maintaining your own trailer, running a small shop, or doing a quick pre-trip inspection, TEDS delivers fast, repeatable results without the frustration.
Common Problems TEDS Helps You Find
- Dead or intermittent running lights, turn signals, and brake lights
- Bad grounds, corroded pins, loose connectors, and plug/adapter issues
- Voltage drop and weak circuits that “look fine” until you load them
- Miswired plugs and “it works sometimes” electrical gremlins
FAQ
Does TEDS work with a standard 7-way RV connector?
Yes — it’s designed around the common 7-way RV blade connector, and it includes an RV-to-4-flat adapter for quick light checks.
Can I test lights and trailer wiring without the tow vehicle?
Yes — TEDS provides the power and circuit selection so you can verify functions without needing the truck connected and running.
Will it help diagnose bad grounds and corroded pins?
Yes — many electrical problems come from grounds and connector corrosion. By testing circuits under load, weak connections become easier to identify than with simple “indicator-only” testers.
Does it support brake circuit diagnostics?
Yes — you can diagnose brake wiring issues by applying load and confirming the circuit. If you’re running higher-draw brake setups (for example, multiple brake magnets drawing current at the same time),
you may need a higher-capacity load tester like TEDS PRO (20A) for full-power testing.
Can TEDS test 2-axle brakes when set up with a Milwaukee M18 or DeWalt 20V MAX battery?
Electric trailer brakes draw real current — typically ~3.5A per wheel. A 2-axle trailer (4 wheels) can demand around 14A when the brake circuit is applied.
TEDS is built around a 10A system. The internal power system and circuit breaker are rated for 10A maximum output.
When using a Milwaukee M18 or DeWalt 20V MAX battery adapter, TEDS must use a DC-DC voltage converter to step down the higher tool-battery voltage. That converter limits output to 10A. While the breaker may tolerate a brief overload (about 5–8 seconds), sustained application of 2-axle brakes exceeds the intended rating and is not recommended for extended testing.
If TEDS is ordered with the internal battery or used with a Milwaukee M12 battery, no high-voltage step-down conversion is required. In these configurations, short functional tests of 2-axle brakes are typically possible because the system can briefly tolerate overload long enough to confirm activation.
For repeated or continuous full-load testing of multi-axle brake systems, TEDS PRO is recommended, as it is designed for higher-current brake diagnostics.
TEDS is built around a 10A system. The internal power system and circuit breaker are rated for 10A maximum output.
When using a Milwaukee M18 or DeWalt 20V MAX battery adapter, TEDS must use a DC-DC voltage converter to step down the higher tool-battery voltage. That converter limits output to 10A. While the breaker may tolerate a brief overload (about 5–8 seconds), sustained application of 2-axle brakes exceeds the intended rating and is not recommended for extended testing.
If TEDS is ordered with the internal battery or used with a Milwaukee M12 battery, no high-voltage step-down conversion is required. In these configurations, short functional tests of 2-axle brakes are typically possible because the system can briefly tolerate overload long enough to confirm activation.
For repeated or continuous full-load testing of multi-axle brake systems, TEDS PRO is recommended, as it is designed for higher-current brake diagnostics.
What’s the difference between TEDS and TEDS PRO?
TEDS is the simple, rugged grab-and-go tester. TEDS PRO adds higher-capacity load testing and more detailed feedback for high-throughput shops and tougher troubleshooting.
| Manufacturer | Dunarri |
|---|---|
| MPN | TEDS |
| Fits | Universal Part/Fits Many Units |
| Part Status: | In-Production |
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