Hi all. I drive a marea JTD 1.9 2001 . Been having intermittent problems with the headlamps.The sidelights work.The full beam works. but the dipped beam doesn't work.Before, he dipped beams would be temperamental and a thump would get them to stay on but now no joy. I guess there's a loose wire somewhere but could i be wrong.Also noticed that when the sidelights are on the left lamp is dimmer then the right lamp. I have checked the fuses etc. but nothing is blown so any advice would be very very welcome.