7 Pin Trailer Plug Tester And 4 Pin Trailer Tester With Dual Sided LED Indicators For Boat RV Truck Camper Wiring 2 In 1 Trailer Light Tester For Flat 4 Pin And RV Blade Connectors Not For Vehicles With Lamp Out Sensor

2-in-1 Trailer Plug Tester for 4-pin and 7-pin RV wiring ✔️ Dual-sided LEDs read 4-pin and 7-pin plugs quickly

This single-unit tester combines both 4-pin flat and RV blade 7-pin trailer wiring checks, letting you verify trailer light circuits on trucks, boats, campers, caravans, and other towed vehicles. Note: Not for vehicles with lamp-out sensor.

✅ 2-in-1 tester for 4-pin flat and 7-pin RV blade connectors
✅ Upgraded double-sided LED indicators for easy reading on both sides
✅ Tests six trailer light functions: taillights, brake lights, reverse lights, turn signals, electric trailer brakes, and 12V auxiliary power
✅ No batteries or wiring needed; plugs into the vehicle for testing
✅ Durable ABS plastic body with tin-plated copper terminals for reliable conductivity

💡 What is a trailer plug tester used for in boat and RV wiring?

A handy tool for quickly verifying trailer wiring and diagnosing lighting problems. It supports both 4-pin flat and 7-pin RV blade connectors and indicates statuses with LEDs.

- Tests taillights, brake lights, turn signals, reverse lights, 12V auxiliary power, and electric trailer brakes

- No batteries needed; uses vehicle power for testing

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