246 No lights!

Drove my Dino last evening but couldn't get the side/dipped/main beam to work. Indicators / repeaters work. Fuses all ok but no power to any of fuses which deal with headlamps side (park lights). If I take power from interior light fuse and bridge to park (side light) fuse then side lights work and so on. Is there a relay that powers up the park light fuse which I believe needs to be working for main/dipped beam to work. Noticed yellow wire that goes to relay . Thanks.