Strange light bulb failure

[Mark R]

That was caused by arcing, not shorting out.  For a fuse to blow, you have
to short out AND exceed the rating of the fuse (hence the need for proper
fuse sizing).  That burning is dangerous (fire hazard) and was caused by a
poor connection allowing an air gap which caused arcing.

Mark Rosenkrantz

On Nov 17, 2007 5:26 PM, Arthur Marks <aamarks at cox.net> wrote:

> I had a turn signal / parking bulb go bad on my A4. The filaments were
> fine
> and still have continuity but the contact burnt. Pic here:
>
> http://img3.freeimagehosting.net/uploads/7c42771d10.jpg
>
> What causes this? Shouldn't a fuse blow before something like that
> happens?
>
> --Art
>
>