notnutnut

Had this old motor a few years now absoloutly no problems at all, however, a couple of weeks ago I noticed a warning light on dash when lights on but couldn't work out what it was then one evening I noticed it had gone out and soon after that i had no main or dip beams (still head flash though). I took the earth off battery while i repair the earth lead between the engine and nearside chassis leg and when I tested it again I had main beam again but no dip beam. When I pulled the light switch out one click and checked it seemed I had main and dip beam on together but i still had the warning light on. Seems like all the bulbs work ok but not the dip without pulling the *** out, any ideas anyone please.