I would pull the rear left tail fixture and look closely at the wiring
connector that plugs into it. It sounds like there is a ground problem
local to that fixture.

Mark

Craig Cowan wrote:
> Thanks to all replied to my previous post about strange blinker problems. I've narrowed down the symptoms thus posting a new post.
> My 90gl auto has blinker problems.
> The left blinker blinks properly until the brakes are applied, then the taillight blinks the brake light rather than the blinker. This only Occurs on the left side.
> With the flashers on, they work fine, until you apply the brakes and the left taillight will blink the brake light.