Steve Brookes
Moderator
When I got my 987 a few weeks ago it still had the original battery fitted. Being 5 years old it's clearly on its last legs. Very laboured turnover when starting the car.
So I put in a Bosch Silver S5 which in my experience is a much better battery than the Porsche Moll version. The car now turns over properly on starting. However, I noticed that the interior light and footwell lights stayed on even though the doors were shut and the engine on (switch in the courtesy position). So I have to have the interior light in the off position all the time. If I put the original battery in the lights work as they should with the switch in the courtesy position!
How the heck does that work? Can the car tell when its got a non-Porsche battery? Do I have to buy a new Porsche Moll battery to get everything to work normally?
So I put in a Bosch Silver S5 which in my experience is a much better battery than the Porsche Moll version. The car now turns over properly on starting. However, I noticed that the interior light and footwell lights stayed on even though the doors were shut and the engine on (switch in the courtesy position). So I have to have the interior light in the off position all the time. If I put the original battery in the lights work as they should with the switch in the courtesy position!
How the heck does that work? Can the car tell when its got a non-Porsche battery? Do I have to buy a new Porsche Moll battery to get everything to work normally?