72 Dart no turn signals or hazards

I've got a shop manual and a huge color coded diagram, still stumped tho. When activating the signals with the flashers that functioned before the new cluster install, the rear lights will light up (no flash) but the front will not.(There's nothing) Put OEM flasher back in (just happened to have one) and all lights light up as they should. They just don't flash. I'm wondering if I have to install resistors due to the system being 100% LED now. I'll start fresh again tomorrow and trace everything and hope I have some luck.