In the sedan's wiring, the only common electrical path between the turn signal and the brake lamp common specific to the left turn signal is the ground return from the bulb sockets to the car body. Number one suspect is a small amount of resistance at the screw attaching the black wire to the body sheet metal, but you will want to check the flex circuit board end of that wire too.
Try re-tightening or cleaning that ground wire terminal.
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Art Benstein near Baltimore
"You can observe a lot just by watchin'." -the late Yogi Berra
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