Hi, I installed this product: DROK® DC Buck Voltage Regulator Converter 17-35V 24V to 12V Regulated Power Supply Convert Module Waterproof 3A Car Volt Converters…
on a large Mitsubishi Van to light up a sign on the roof. The sign illumination is working ok but now I get an interference in the radio. Appreciate if you give me a hint on how to solve this.