A more common reason why this can happen is that those dual filament
bulbs come 2 ways. One has the brighter filament connected to a bulb
contact where the other version instead has the dimmer filament on that
same contact. That is why I asked you to make sure that you had new
identical bulbs and also why I said that comparing the brightness with
the 4 ways flashing could tell you which bulb was the problem. Of course
you could also likely have seen that one front parking light was
brighter than the other indicating a mismatch of bulb part numbers.

Mark

Tom Young wrote:
>
>
> > When your right and left blinkers are flashing check in the
> > bulb to see if it the same wire that flashes. Those bulbs are
> > double contacts therefore have, two filament one should be
> > shorter than the other. It should be the same filament that
> > lights up in each bulb if it's not the same it means the wires
> > in the back of the socket the bulb is in are on the wrong
> > connection just swap them for one of the bulb and it will
> > fix your problem if that is the case.
>