i need help with my side lights on my 156 year 2001.they do not work front or back all fuses and bulb are fine .a previous owner has done a bodge on the wiring at the back lights they have linked both sides together .is there a relay or control box that could of burnt out and where could it be on the car,

hope some can help me as i have been pulling my hair out all day and have a car in bits.