My bulb out warning light keeps illuminating followed by a scary sounding 'beeeeeeeeep'. It only happens when the headlights are off and is intermittent. As soon as i switch dipped beam on the light goes off. Ive changed the brake light bulb a few months ago and just been and bought some new tail light and indicator bulbs as I know they are the originals and im guessing the resistance changes as they get old. what else can I try as all other bulbs are working. Which bulbs does the