NTI-4-5 Fits 2014-Up HD Big Twin Models, except XL

NAMZ trailer isolators are intended to protect the motorcycle’s factory turn signal lighting module from being overloaded when adding a trailer. Our trailer isolators draw power from the motorcycle battery in order to energize the modules trailer output and protect the draw from the motorcycle. Once the module is plugged in between the rear fender harness, it simply receives signals from the lighting circuits telling the module how to light up the trailer. Fits 2014-Up Harley® Davidson Big Twin Models except XL.