the Output tester 137
By Lite-Check
Next Gen TRUCK & TRAILER DIAGNOSTICS
Modern trailers are more demanding than ever. LED lighting, added electronics, and safety systems all depend on clean, consistent power. The 137 Output Tester is designed to keep up. It simulates real electrical loads at the truck output, so you’re not just checking for power — you’re confirming that the truck can support real operating conditions without voltage drop or inconsistent output.
By testing directly at the truck connection with a 7-way interface and gladhands, the 137 helps you find problems before they show up in the field. You verify output performance where it matters most: at the truck-to-trailer connection.
Simulate Actual Operating Conditions.
The 137 Output Tester lets you replicate how a trailer actually loads the circuit. Instead of testing with a multimeter and hoping the system behaves under real load, you apply known electrical loads and observe how the system responds. That means you can:
Verify electrical transfer performance from truck to trailer
Identify voltage drop on loaded circuits
Catch open circuits, weak connections, and intermittent faults
Confirm that output is sufficient for today’s trailer requirements
This load-based approach removes the guesswork. You’re not just seeing if power is “on” — you’re proving whether the system will hold up under real-world demand.
Electrical failures aren’t just an inconvenience — they can create unsafe operating conditions, road calls, and expensive downtime. The 137 Output Tester gives you a structured way to validate electrical output before a truck is paired with a trailer or sent out on a route.
By detecting issues early, fleets can avoid unnecessary parts replacement, prevent repeat failures, and extend the life of both trucks and trailers. Consistent testing helps support compliance with industry standards and keeps lights, ABS, and related systems powered the way they were designed to be.
PROTECT FLEETS FROM COSTLY ELECTRICAL FAILURES
-
The 137 simulates real electrical loads at the truck’s 7-way connection and checks voltage performance under load. It also verifies air output and warning system operation. Instead of just checking for power, you see whether the system can holdthat power under real-world conditions.
-
Fleets, repair shops, and OEMs that want fast, reliable diagnostic results. If you maintain or build trailers and need to confirm a truck’s output performance before it hits the road, the 137 gives you a repeatable and trustworthy way to do it.
-
By pinpointing whether electrical issues come from the truck, the wiring, or the connection hardware. Techs skip the guesswork, avoid unnecessary parts swapping, and get equipment road-ready faster with fewer comebacks.
Output tester 137
Look at what others overlook.
Discover the simplicity and accuracy of the Lite-Check 137 Truck and Trailer Output Tester. Designed for effortless use, this essential tool provides technicians with precise output readings for commercial trucks, trailers, and dollies. Simply attach the included 7-way cable and gladhands to the output receptacle of the vehicle, and the tester delivers accurate air and electrical readings on its clear 4.75” x 1.75” LCD screen.
Engineered for efficiency, the Lite-Check 137 ensures reliable diagnostics, helping you maintain optimal performance and safety. Streamline your testing process and trust Lite-Check for superior quality and dependability.