The Motorcycle LED Lighting Source

LED auxiliary lights and FM Radio interference

Posted by on Nov 1, 2013 in Blog | 0 comments

We recently had a customer purchase a set of our LR4 Quad Cree XML U2 motorcycle lights that were installed on a Honda Goldwing. The customer reported that when the lights were turned on it caused interference with the FM radio signal. After some research we discovered that the cause of the radio interference was due to the PWM (Pulse Width Modulation) circuit in the lights which was being picked up by the radio through the wiring. We suggested installing a ferrite choke on the LED leads and shipped a set of Fair Rite RF chokes to the customer. Our customer reported back that once the chokes were installed on the wiring, that the lights being on no longer had any effect on radio reception :). If you’re have problems with your LED motorcycle lighting affecting FM or AM radio reception, we suggest installing the following ferrite chokes.

Fair-Rite 0431164181 EMI/RFI Suppressor:



When installing RF chokes on your wiring, it is best to get the choke as close to the light as possible. The wire should also be looped once through the choke, so the core clamps around the wire loop.

Note that any ferrite core choke with a frequency range of 1MHz to 300MHz should work for this application, and are available at Radio Shack and other electronics stores.