I have had this trailer since July and noticed a few weeks ago that my left rear light does not signal for left turns or when I brake. The left side regular lights work as well as the plate light. They are LED and the box does not open. My trailer has a 5 pin and my Jeep has a 4 pin. The 5 pin has 1 extra for brakes? Do the connectors coming from both the Jeep and trailer need to be the same? Both 4 or 5 pin? Light box problem?