[924CarreraGTP]

MPDano said I should post this to this thread, So here it is.
Porsche 928 electrical short tip!

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Many times the overhead interior light can short and drain your battery. You can spend years checking the jumper, cleaning the grounds and pin connectors and never find it.
It is a common problem and you must remove the fuse to the overhead light.
Another thing, doing a draw test and pulling every fuse to find a short is tedious while standing on your head in the 928 floorboard. You are better off getting a clipboard, checking all systems and writing down the ones that don't work. Remove one fuse each day from the nonworking systems until you find the short. I narrowed mine down to the trunk latch, antenna and the interior light. The interior light was the short.
I hope this helps with your Shark ownership.
If you talk to enough people somebody will eventually tell you that the overhead lights short onto the body when the fixtures are rebulbed or due to the tabs bending. Its a common problem but so many people will tell you to check your jumper circuit and grounds only to leave you in the same place. My 928S now holds its battery charge for months on end.