Check N Tow Go — 7-Way Blade & 4-Way Flat Trailer Light Tester
Check N Tow™ 7/4-Way Trailer Light Tester – Cordless, Portable, Built to Last
Powered by the tool batteries you already own (with the correct adapter).
- Milwaukee
- DeWalt
- Snap-On
✅ Higher Output + Resettable Protection
Check N Tow is built to withstand a 20A Output capacity allowing for higher demand testing with less nuisance trips and built with 3 resettable breakers to protect the tester components
Most other trailer testers top out around 10A.
💡 Test Any Light Combination (Not One-at-a-Time)
Check N Tow uses individual switches so you can test lights in any combination - just like a real tow vehicle (brake + turn + running lights, etc.)
Many trailer testers only allow one function at a time.
🚦 Real Vehicle Behavior Simulation
Check N Tow use a combination of resistors, relays, and a flasher to verify and simulate real vehicle behavior like turn signal override, brake hold, and proper flashing performance for more accurate diagnostics.
Basic test boxes can give false confidence because they don’t simulate real vehicle behavior.
💡 Works with LED + Incandescent
Check N Tow is designed to support both LED and incandescent trailer lighting for consistent, reliable testing.
Some testers struggle with LED or only work well with one bulb type.
🔌 Multi-Connector Support
Check N Tow natively supports both 7-blade and 4-flat connections, with additional connector support available using adapters.
Single-plug testers limit what you can test.
✅ Bottom line: Check N Tow isn’t just a light checker—it’s a shop-grade diagnostic tool built for stronger output, realistic testing, and durability.
The Check N Tow was built for people who depend on their trailers and need a tester they can count on — not another cheap throwaway tool. It is compact enough to fit in your toolbox, but built tough enough for shop, fleet, campground, and roadside use.
Unlike many lower-cost testers, Check N Tow is hand-assembled in the USA, one unit at a time, with serviceability in mind. If something ever needs attention, we want repairs to be simple and affordable whenever possible — because we care about the people using our product after the sale.
Our goal is not just to sell you another trailer tester. Our goal is to build the last trailer tester you need to buy.