Radio Interference

I rewired the entire car using a Painless Wiring harness and ever since, when I turn my turn signals on the radio goes fuzzy. It'll go in and out of being fuzzy as the blinker blinks. I have LED bulbs in my turn signals with an LED specific flasher unit that is grounded separately.

Is there a filter that I can add somewhere to eliminate the interference? It's a Pioneer headunit if that matters.