Porsche Enthusiasts Club Forum

Hi,

I have a 1990 928S4 and whenever I leave it for more than 24hours without driving the battery is flat.

I've been told its common on 928's so i had an isolator fitted to the battery so I can disconnect it easily when left.

I would like to get to the bottom of it and try and fix it, anyone have any ideas? are there common places to look first ?

thanks

Hi
I am fairly new to 928s but try the interior lights are any staying on when the car is locked?and if some are not working it could be that theres a poor earth .On another car i own a starter motor fault was draining the battery overnight
hope this may help
cheers Grahame

Thanks Grahame, will take a look again as this was the first thing I checked