A4 intermittent electrical fault

[chekers]

Audi A4 S-reg 1.9tdi...
Can someone explain why my windscreen wipers stop working? The indicators also stop working although hazard lights remain active. I have noticed that when this happens, the following items also fail, Fog lights, rear window heater, indicators windscreen wipers and the air con/heater. Its an intermittent fault and its not clear which item is to blame. I suspect the heater and logic controls for it, but is there anyway all these functions could be linked in some way?
The main dealer has replaced the ignition switch...it did not cure the fault.
Any ideas welcome, thanks

[cusford]

vag com might bring a code up? could be a bad earth somewhere? if its intermittent, i cant see if being a fuse. but its worth a look.

[chekers]

Thanks cusford, its not a a fuse, I know that, but I guess it could be a bad earth...where would I look for this?

[cusford]

i wouldn't know i'm afraid. maybe someone local has vagcom? that will help a lot as it will come up with codes ending in 'short to ground' ..

[chekers]

Okay thank you for your help