I feel like I’m in the movie “every which way loose” Left turn Clyde. 😂

when I press on my brake and the left turn signal is on the lights in the back on the left side go crazy and blink.
when I have the switch for all the lights on outside and hit the brake they flash

I have changed the break light switch

could it be the relay?

and witch one is it the engine fuse box?

 

Often it is the wrong lamps or lamps not properly installed that create a short to other lamps.