A small problem: The "knackered bulb" indicator in the car is lit but goes off if the sidelights or headlights are switched on, indicating a fault with a day-running light.
One day-running light is brighter than the other because *both* filaments (stop and tail bulb - 21w/5w) are lit and the other only has the 5w filament lit. If I turn the sidelights on then only the 5w filaments are lit, both sides. The bulb *looks* fine but I haven't got a replacement to hand, nor a tester, which is at someone else's house at the moment.
Are both filaments supposed to be lit when the day lights are on or just the
21w one?Si