hazards blowing fuse now.

Question. I have a 71 dart with a rally dash. All the lights where working before hand except for the horn. I mean the turn signals and the hazard lights. Also if you put on the left hand turn signal the switch wouldn't stay down because the plastic was broken I believe. I replaced the wiring harness and switch assembly with a new one. Now when I turn on the hazards or the left turn signal the volt meter jumps up and down and those lights don't work. If I leave it on very long it blows the fuse. If I turn on the right signal it works and the horn works now too. The wiring harness for the dash is new a couple years ago when I started the rebuild. Any idea on where this issue may be? I am guessing ground issue. I have checked all the grounds that I can think of. Also I should add, the lights all work, hi beam, low beam, all marker lights and brake lights. Thanks all.