inputs.text: follow advice mr rg correct inverted polarity - decided way cleanly wire car auto daynight rearview mirror dealership installed could not get good splice tight wiring usually go sunroof not option time kit best solutionper advice mr rg review checked polarity correct barrel plug red wire going outside black wire went inside wires not crossed internally would make shortthe wires going connector car formfit no way push solid core wires gaps since no gaps alternate solution worked much better take pins push straight perpendicular wire trying tap pull pin chase solid core wire tip insulation chance close wire check conductivity multimeter good fold wire tape repeat wiredone not much else say except always check polarity dont trust instructionsbecause extra research required well triple checking facts 5 stars working 1 star time spend avoid shorting radar 3 stars overall product