Why Check N Tow
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. Compact enough to fit in your toolbox, tough enough for shop, fleet, campground, and roadside use.
20A output + resettable protection
Higher demand testing with fewer nuisance trips. Three resettable breakers protect the unit.
Test any light combination
Individual switches let you fire brake + turn + running lights together — just like a real tow vehicle.
Real vehicle behavior simulation
Resistors, relays, and a flasher simulate turn override, brake hold, and proper flash performance.
Works with LED + incandescent
Consistent, reliable testing across bulb types.
Multi-connector support
Native 7-blade and 4-flat with adapters for other plug styles.
7-Way Blade & 4-Way Flat Trailer Light Tester | Check N Tow Go
- Check N Tow Go trailer light tester
- Selected battery adapter
- 7-way blade & 4-way flat connector
- Quick-start guide
Reviews
I used this to test out my new boat trailer. It allowed me to check all my lights, and I discovered that I had a few bad grounds! I was able to get everything working as it should and was able to take the boat out! I'm glad I added this to my toolbox. Im confident that this tester will keep me safe and legal with all my trailering activities.
This is one of the best trailer light testers we've ever used. Our shop technicians love it. Whether we're wiring new trailers or diagnosing issues on older ones, Check N Tow cuts our diagnostic time in half, allowing us to provide faster service and pass those savings on to our customers.
Sucha practical product for testing trailers on our lot. So simple to use and love I can test all the lights at the same time.