7/4-Way Plug Trailer Light Tester

Check N Tow™ 7/4-Way Trailer LightTester – 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 resettablebreakers to protect the tester components
Most other trailer testers top out around 10A.
 
💡 Test Any LightCombination (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 VehicleBehavior Simulation
Check N Tow use a combination of resistors, relays and flasher to verifyand 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 realvehicle 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-ConnectorSupport
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 ashop-grade diagnostic tool built for stronger output, realistic testing, anddurability.