Hi, I wanted to give my second car a starter today because it weakens a bit. So plus connected to plus and minus to mass. I wanted to leave the donor car on and nothing happened. The starter didn’t even try. Just a crack, like with a defective battery. Everything stuck off again and it still didn’t work. Only after a few minutes the donor car jumped again. Now it only shows the symbol for the immobilizer and doesn’t start at all. Cars dead. Do you have a tip on what the other car might have? In normal weather it still starts, even if the voltage drops to 10,5V when starting (from 12,1V).