I cleaned the engine bay on my 2002 sti at the weekend.....

ever since my battery is showing 11volts so I have been putting it on charge every night since...

The battery light flashes on the car while you drive along and has flashed up on my psi3 display low battery voltage twice,,

I have checked the alternator and there is no output to the battery

I possibly could have got water in it, so have been advised to spray wd40 in the back of the alternator.. tried this - no go

any ideas?

cheers

Andy

 

sounds like the water has fooked your alternator apparently scooby alternators are easily damaged by water
sorry to be bearer of bad news but in my opinion it will need changing