Ignition Switch Connector Fail

Disagree. Anderson connectors ARE NOT MADE for permanent connections unless you find a way to retain them, IE zip tie, heat shrink, or tape. They do not have any form of latch or connector retention, other than "a small amount" of friction in the connection.

I've no idea what sort of automotive repair connectors are available in Germany, but as I mentioned earlier, the 1/4 spade/ flag terminals are very popular, and have a fair amount of friction retention