I have ST60 system and I added a 2500 ouf, 50 VDS power supply but the filter problem is same and there are no any changes for it. I was tried to do good but still now I am not getting any good solutions. Above all posts replies are helps in some cases only.

Break the power relay is connected to the radio, which is starting to close, so you can feed the relay coil. Start your switch, may have such contact. In this way, starting the engine, or the use of electric winch, do not mess your power.