Strange turn signal/brake light issue

I've got a good one here... So let me just say that all the bulbs ARE working.


Left turn signal works normally when headlights are off. When I have the headlights on and the left blinker I get a fast blink on the dash, but the brake light and the rear running lights are alternating. Nothing from the actual turn signal bulb.


Brake lights work fine as long as I dont turn my headlights on or use the left turn signal.



If I have the headlights on and hit the brakes, I have no left brake light.



Using all 3 once and I get a weird mix of lights coming on.


Right side works fine. I checked my wiring at the tail light as I have a Greg Davis bumper and have used amber bulbs in the turn signal housing. But that checked out and Its been like that for years.

I also swapped the left and right turn signal relays. No change.



Everything works individually, just not combined.




Could it be the head light stalk? Not sure what else it could be?

SOLVED!


When I installed the onboard water system, I had removed a capped plug from the body, since it was in the way. Not realizing that it was a ground bus and was using the mounting ring as the ground for all the rear lights. So I extended the ground out to a new location. Problem solved. For reference its a grey clip with a white cap.