Need help.

Skoda fabia 1.4 tdi.

New alternator and battery fitted

Car still cuts out loose powering steering stop light comes on etc etc

What's wrong??????

There are 2 wires from alternator that loop across the front of the engine bay via a plug/socket approx under battery. These break giving rise to the symptoms you describe - common problem. Often you can see the broken wire(s) at the plug.