Portable Trailer Light Tester Box – Wireless Remote, Built-In Battery, Full-Function 7-Pin Diagnostic Tool

Test Your Trailer Lights in Seconds — No Truck, No Hassle Check brake lights, turn signals, and tail lamps instantly without connecting to a towing vehicle.This portable 12V trailer tester with a built-in battery and wireless remote saves time, keeps you safe, and eliminates guesswork on the road. Why Choose This Trailer Light Tester? One-Person Operation: Wireless remote lets you test all trailer lights solo — no need for a helper or constant back-and-forth. Full Lighting System Check: Detects brake, reverse, tail, and turn signal faults with precision. Instantly confirms wiring and connection integrity. All-Weather, All-Purpose: Aviation-grade aluminum body resists shocks, corrosion, and extreme temperatures. Perfect for year-round use. Built-In 12V Power Supply: Integrated 10Ah lithium battery runs up to 8 hours — no external power source required. Universal Compatibility: Works with 7-way round pins and 3/4/5-flat pin connectors — suitable for cars, trucks, campers, RVs,