This is the result of electromagnetic interference. Confirm the switch wires do not contact or come in close proximity of the radio antenna. If that doesn't work, add an accessory fuse panel and ground bar that is separate from the radio. Use the factory accessory post as the on lead to a 80Amp relay powering the accessory fuse panel.

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I'd suggest as Yooper82 says...install another switched fuse block under the hood. That's what I did. one is hot all the time, the other is switched using the 10 amp accessory wire for the trigger.

Pirate

 

You can also try installing a ferrite choke on the power wires to your lights.

 

This ^^

Many lower cost lights create radio noise. The LED headlights I put on mime do and I expected they would as they were $150 for the pair ....


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That's right. I read that the cheaper lights don't have the filters built in like some of the more expensive ones. The ferrite choke fixed my light bar interference but it took more than one. The good thing is that they're cheap too.

 

There are different sizes according to what size wire you're using.