Porsche Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to Just Answerthe battery light is actually an important part of the charging system as the load from the bulb switches the alternator over to charging,
1st check the wiring to earth for the bulb and also check the bulb is the correct rating
also check that the alternator is secure to the engine as this provides the ground for the charging circuit and make sure that the engine / gearbox earth strap is secure and the contacts are clean and bright.