I have spent hours to connect my new battery. The following problem: The components are the same as before. Only that they are now fed by the additional battery (instead of the starter battery) [Trennrelais]. It is now a “Plöpp” (so a turn-on impus) over the speakers. From the subwoofer it is hard to hear and see. (Monoblock) But it comes from the front system as well. (4-channel) The “Plopp” not only works when switching on, I’m surprised when you turn the volume from “nothing” to “it comes music” on the radio. What can this be all about? I’ve also tried to feed only one amplifier with the music signal (chinch) (Y adapter away).