Hi guys !! I have a real problem that gets more illogical from day to day. I bought a Golf III a few weeks ago and then started to install boxes, subwoofers and power stage ( Signat Roc1). Then the following problem arose: Every time I took my foot off the gas the power stage went off !!!! When I then gave gas again it went on again. However, the speed is completely irrelevant, if I gave gas e.g. in idle mode it went despite m not on !!! Since it was time for a new battery anyway, I bought one and had to find out after the installation that the power stage is now no longer concerned !!! So I removed the power stage again and first checked the conductivity of the cables ( current and mass ), but they were full. Then I opened the power stage and looked for defective soldering points or the like … that also resulted nothing !!! Then I installed the power stage again and re-installed the mass cable again and see … I have no problems, everything is running perfectly !!! Now my car was one day in the workshop for the timing belt change and afterwards …. everything again as before, the final stage only goes on if I give gas with inserted gear !?!?! He would be really great if someone could tell me what is going on or where the error is. I am really at the end with my Latin !!!!!! Thank you so much for your answers…