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- A ferrite bead (also known as a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke) is a type of choke that suppresses high-frequency electronic noise in electronic circuits. Ferrite beads employ high-frequency current dissipation in a ferrite ceramic to build high-frequency noise suppression devices.
I recently learned about these little items that eliminate radio noise as a result of LED bulbs, electrical motors, such as in beacons. I haven't tried this yet on my car, but I wanted to pass this information onto others, should they want to give this a try. The Ferrite rings are inexpensively sourced from eBay, Amazon, as well as other online sellers. Please post your experience once you give it a try.