Hello together I’m about to despair… When my car didn’t start after about a month of not driving, I assumed that the power in the battery is all. Now I’ve charged the battery, with the multimeter it now shows me 12.7 volts. Unfortunately, nothing happens at all, it’s only when no battery is connected. At first glance I didn’t find a bit of cable. Did someone have an idea what I can do or where I still have something nac can it be because these plates where you can see on the battery are not completely clean anymore? Friendly greetings