Audi A4 1.8t

Hello everyone:

my car is an Audi A4 1.8t of 97, although I think the model is that of 95.

My problem is with the lighting. It turns out that with the engine stopped and the given contact, everything works correctly.
When I start the engine, the short or long light does not work (the position of yes and the bursts too); And neither do the flashing (the light of breakdown yes)

know what can this be due?

I did not find the mechanics manual of my car. Could someone tell me where to find it?

Thanks in advance