Left turn signel not working while applying brakes?

[superman22x]

My left turn signal doesn't work when I am applying the brakes. But other wise, it is just fine. When I hit the brakes, the blinker light on my dash for a left turn lights up about 50% of full brightness, and stays solid, until I let off the brakes. And when I have the brakes on, it will not flash at all...
Maybe just two wires touching or something? I'm not sure what is wrong really...

 

[superman22x]

I read it might be a ground problem. Where is the ground that goes with the turn signels?...

 

[Caulk04]

Start at the tail lights and work your way forward, check for frayed wires.