Wesbar 119250 Zero Contact Interface Universal Trailer Light Isolator

The Wesbar 119250 Zero Contact Interface (ZCI) is a universal trailer wiring isolator that eliminates the need to cut, splice, or tap into your tow vehicle's factory wiring. Using advanced ZCI sensor technology and a direct connection to your vehicle's 12-volt battery, this device completely isolates trailer light operation from your vehicle's electrical system, preventing interference with sensitive electronics and computer systems.

Key Features:

• No cutting or splicing of vehicle wiring required—preserves factory wiring integrity
• Completely isolates trailer lighting from tow vehicle's electrical system
• Universal compatibility with 2-wire or 3-wire trailer systems
• Works with PWM (Pulse Width Modulated) and multiplexed vehicle electrical systems
• Compatible with low-side switched vehicles
• Rated for up to 4.2 amps on turn/stop circuits and 7.5 amps on taillight circuits
• Integrated auto-resetting short circuit and overload protection
• Robust weatherproof design for interior or exterior mounting

This universal model is ideal for modern vehicles with complex electronic systems where traditional trailer wiring methods can cause error messages, bulb-out warnings, or damage to vehicle electronics. The zero-contact design ensures your vehicle's warranty remains intact while providing reliable trailer lighting performance. Compatible with 12-volt systems only.