"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.