Very strange problem with the starting

[Flubbie]

Hi,

I'm having a H2 03 and I have right now a very serious problem with the starting of my ignition.

First I had the problem that my complete dashboard (lights) were dimming at a interval from about 2sec for 0,5sec.

Once the engine was running for 20sec this problem went away.

Right now I think it came back and maybe even worse.
Now when I try to start my vehicle then it's doing nothing at all. If I try it several times then suddenly the engine is starting.
When we put a wire over the contact switch then the engine is starting and when releasing the wire then the engine is stopping again.

Any toughts what the problem could be?