All the 3 left tail lights are blinking

[mickeypowa]

Hi!!

I have a problem : when I put the left blinker, then all the taillights are blinking.
No problem if I blink right with the right tail Light.
I try to put all thr bulbs from the right to the left side and the problem is still the same so it doesnt come from the bulbs...
Here is a video :

Have you some idea ??

Thanks a lot


Mickeypowa

 

[Scrappycrow]

That looks to be a classic grounding problem. The bulb's turn signal filament cannot see ground to the chassis, so it ends up going through the bulb's tail light filament and the other bulbs' positive filaments and into those positive circuits, ultimately grounding elsewhere. My bet is the lights on the other side are flashing faintly when this is going on.

Oldsmobiles from the early '70s thru the late '80s with "stacked" tail lights were prone to this issue.