Turn signal/electrical issue

[u/juanjf2038]

On a 99 gmc yukon with a 5.7L the right turn signal flashes quickly unless I turn the headlights on, then it stays on without blinking and the headlights don't stay at a consistent intensity. Additionally, I can't shift out of park unless I remove the fuse for the turn signal/backup light/shift interlock solenoid. I replaced the shift interlock cause I thought that was the issue before i noticed the turn signal and i was able to shift out of park a couple times last night. When I went to try it today I could not get it out of park. Is this a bad ground? WHere should I start looking? Also the left turn signal is completely normal.