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Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21631
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Porsche Baxter s: New battery on Porsche boxer s , battery

Customer Question

New battery on Porsche boxer s , battery not getting or holding charge, but no light on dashboard saying fault with alternater , Please help Regards. Julia
Submitted: 2 years ago.
Category: UK Car
Customer: replied 2 years ago.
Waiting for quick reply regarding Porsche battery a alternater, , time you said for answer was 8 mins , that was 30 mins ago
Expert:  Matt replied 2 years ago.
Hello I'd first check the easy things like is the boot light or any other interior light staying on then check that the main battery connections are tight and in good condition also check the earth strap to the engine / gearbox. NextI'd check the current drain aspect, the best way to find what circuit iscausing the excessive currant drain is to fit a current sensing multimeter inseries with the positive battery lead on the car and the battery, or use acurrent clamp meter on the battery positive cable. A typical current drain with everything off and un-alarmed should be around0.05Amp and if its higher than this remove a fuse and re-measure, if measurement doesn't change then replace the fuse and remove the next. Once you've isolated the circuit with the excessive drain check the wiringconnections and plugs to components and the wiring harness that runs by the enginebay fuse box - the wiring harness chaffs / rubs through and gets damaged - but its not always easy to see so be careful when checking.. Also check that the alternator is actually charging the battery in the car by taking a battery voltage reading with the engine off then another with the engine running. The 2nd reading should be higher than the 1st and climbing steadily. And 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 secureand the contacts are clean and bright. if the alternator appears not to be working - take it to a electrical specialistand ask them to test it as sometimes you can replace just the diode pack andthis will repair the alternator without requiring replacement And one last thing is – how old is the battery? – As even good quality ones need replacing every 5 years and faulty battery just won’t hold a charge
Expert:  Matt replied 2 years ago.
do you still need help?