Peugeot 206 - problem with right indicator, can anyone help?

I own a Peugeot 206 1.4glx Y reg, my problem is when I have the battery on, my right indicator comes on and is quiet tricky to make it stop, also when I press either of the electric window buttons the indicator comes on then stops once I've pressed them! I don't have this problem when the engine is on, so I'm really not sure what is going on, can anybody help?