Wiring Woes

[Your41Plague12]

Ok guys, I have two separate issues, and I'm hoping someone can enlighten me. The search turned up no results. I just swapped in an 83-84 grille, and now my left turn signal only works when my headlights are off. When the headlights are on, the turn signal in the grille will not flash. It doesn't get dimmer or brighter. The side marker does work though. When the headlights are off, it works fine. The 4-ways work fine with the headlights on and off. I didn't change the wiring at all, and it worked fine with my old (86) grille. I'm stumped on this one. My second issue is even more ridiculous. When I have my 4-ways on and I press the brake pedal, the 4-ways go solid. I imagine the wiring is crossed somewhere between the two, but I'm not sure. Keep in mind, this truck has been so frankensteined together over the years that almost nothing is original. The wiring has been completely butchered by a multitude of people, and I'm just trying to bring it back to 100% working order. It's just difficult to work around other people's previous mistakes. Any ideas? Thanks guys.

Steve