In article , NY wrote:
"Dave Plowman (News)" wrote in message
...
In article , Thomas Prufer
wrote:
And BAY15d may have different-height pins, with two base contacts and
case for ground, for double-filament automotive lights that need a
single mounting orientation (brake & running light, I think is one...)

There are offset pins (height wise) for the older stop/tail bulb. And
then a different offset (not 180 spaced) came in for others - like
amber flasher bulbs.

Why is is that cars always seem to use the dual-filament bulbs for
tail/brake, with a separate bulb for rear fog lights? Given that tail and
fog lights serve the same purpose, of defining the presence and width of
the vehicle as seen from behind, it would be better if clusters were
designed to have tail/fog on the dual-filament bulb and a separate light
for brake.

At a guess, tail and brake are older and more standard. Rear Fog are
comparatively modern and therefore an extra.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle