My left side brake lights nor my left blinker will work. All running lights work on that side but no brake or turn. My question is about my male plug to the truck plug-in. My trailer plug is the5 prong type, not the4 prong which I am used to having. I am basically not using one of the prongs due to the way my truck plug-in is set up. Is that the reasonI am not getting brakes and turn on the left or is it in the wiring?