Holley Retrobright radio interference solutions?

[saltdog]

So I bit the bullet and put the LED headlights in- and they are great! BUT they also totally kill the FM radio. Tried just sticking these ferrite cores (https://www.amazon.com/dp/B08DC9JF5K/) on the leads, but no joy. Called Morrimoto who makes Retrobrights for Holley and they said I need to loop the wires through the core- I wasn't clear on how they would do that with a 1/4 inch ID snap-on core, so will call back. Wondered if anyone has anypics of a proven solution that they've used or if anyone tried using the larger doughnuts like one might do for ham radio- like wrapping the leads around these 55 mm doughnuts https://www.amazon.com/dp/B07PDMWN57/ since the plugs will pass.

 

[Turbo4whl]

Make sure he hood has a ground strap to the firewall. This makes a big difference for FM in the fringe areas.

Believe it or not, the radiator support can also loose it's ground from rusty bolts/surface on the mounting bolts to the fenders. All the front sheet metal needs a ground, easy to test to make sure all the pieces have a ground.