Dash and turn signal issues

alright well i tried to install my new turn signal flasher and it did nothing. Luckily the original one was sitting right next to it, not plugged in. (why? I have no idea...)

So I plugged in the original one and boom! turn signals started working!

So all of my turn signals work except for the front drivers side. Luckily I have an extra grill lying around with both lights installed, so i plugged that one in and nothing.

So I take it now it comes down to the wiring harness.

Any ideas where to look? thanks