High Pitched Elecrical Noise

[filleruptreacle]

Hello guys.I hope someone can help me with a problem ive got with my Focus 2010 1.6 zetec. I bought the car last Wednesday from a Ford dealership and enjoyed three days hassle free driving. I noticed a high pitched elecrical sound coming from the drivers side of the car when the engine was running...alarm bells started to ring.The following morning the battery had discharged.I took the car back to the dealership who put it on the diagnostic machine and said no faults were showing so i had nothing to worry about!! Is this a normal characteristic of the car or something more sinister as im new to Ford ownership. Thanks.

[btmaldon]

Its not a normal characteristic at all. Didn't the garage come up with an explanation as to why the battery went flat in the first place.

All I can think is the battery terminals or earthing points are not fully secure and that may be putting a load on the alternator which may be causing the noise and the flat battery. A two year old battery shouldn't be going flat.

[artscot79]

fuel pump this should be heard its an electric noise it may be that the pumps not switching off its simple for them to test and i wouldnt be accepting there answer get them to check the pumps switching off