I just installed a harness with plugs for rear defroster and sub-woofer and truck release..these switches are on the dash..ok now, I am trying to see if there are relays for the rear defroster and trunk release and if so, where are they located and second, what type or part number or place , who would carry these relays?..now the subwoofer amp..what does this need beside amp to get this thing a workin..anyone out there can help me..thanks..Ozzy