Fitted a new fog light to the motorhome, having bashed the old one off by reversing into an embankment. Tested it. "Oh, it's very bright! Oh bugger! It's gone out!"
"Blow me down! The bulb appears to have no filament! Oh, wait a minute, it's there, loose in the bulb! Oh well, I'll get another one. Now let me see, 21W, 24V, that's the one! Oh bugger! The other one would be 12V wouldn't it? I am a silly chap!"
Bill