Have this text already in the Opel forum … but I think that the question is not wrong here either… “Did a chinch cable pull directly through the car. No noises got better. Even if I don’t have a chinch cable on the radio the noise is there. So it’s not on the radio. Did then try to run the system ONLY over the second battery … didn’t work ??? I’m perplexed. Why doesn’t it? Then I only have the mass from the first battery to the second go The system starts again (i.e. the power amplifiers). How does that work? Why doesn’t the system run with the Exide Maxxima?? Only if I take the mass of the main battery with it, the power amplifiers run (but the faults are still there)! I thought it was on the battery. I then connected everything to the main battery ONLY… And look, this is at the end!! 11V shows my measuring device. The Exide has 12,9V! I couldn’t even have the Aut o so start. But the Helix power amplifier is still on and has given everything only distorted again. Was afraid for my LS. What can that be!!?????? That I need a new main battery is already clear!”