Pollak 12-777 7-Way RV Socket LED Circuit Tester – Vehicle Side Trailer Plug Tester

The Pollak 12-777 7-Way RV Socket LED Circuit Tester is an essential diagnostic tool for every truck owner and fleet mechanic. Designed to plug directly into your vehicle’s 7-pole RV-style trailer socket, this heavy-duty tester provides an instant visual confirmation of your vehicle's electrical functions. No more guessing if the problem is in your truck or your trailer—simply plug it in and check the LEDs.

High-Visibility LED Indicators Equipped with bright, easy-to-read LEDs, the 12-777 identifies the status of six critical towing functions:

• BU: Back-up or Reverse Lights

• RT: Right Turn / Brake Light

• TM: Taillights / Marker Lights

• LT: Left Turn / Brake Light

• BK: Brake Controller Output (Electric Brakes)

• 12V: 12-Volt Auxiliary Power Feed

Built for the Long Haul Constructed from high-impact plastic, this tester is engineered to withstand the rigors of a busy shop or a demanding job site. It features two integrated easy-pull tabs, making it simple to remove from the socket even when wearing gloves. Whether you are troubleshooting a 2024 pickup or a heavy-duty tractor-trailer, the Pollak 12-777 ensures your vehicle is road-ready in seconds.

Key Features:

• Universal Compatibility: Works with any standard 7-way RV blade-style vehicle socket.

• Multi-Voltage Support: Rated for 12V to 24V systems.

• Compact & Durable: High-impact construction with a slim profile for easy storage.

• Error-Free Testing: Labeled function codes eliminate confusion during diagnostics.