Tekonsha ZCI Zero Contact Interface Universal ModuLite - Universal Trailer Light Power Module 
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ZCI™ Zero Contact Interface Universal ModuLite® - Universal Trailer Light Power Module
ZCI sensor technology and direct connection to the tow vehicle battery, eliminates all electrical connection and interference with the tow vehicle electrical system. Vehicles with 12 volt system only.
NO CUTTING OR SPLICING VEHICLE WIRING!
Isolates Trailer Light Operation from Tow Vehicle's Electrical System
Works with 2 or 3 wire systems
Works with PWM or Multiplexed systems requiring 2 or 3 wire hookup
Rated for up to 4.2 amps for turn/stop & 7.5 amps for taillight trailer circuits
Works with low side switched vehicles
Integrated auto resetting short & overload protection
Robust design allows for interior or exterior mounting
WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.