Menu toggle

Battery Keeps Dying if left - new battery fitted but problem still exists???

N

neil7545

New member
Has anyone suffered from the battery draining when the car is not used for more than a week. I have fitted a new battery and even taken my Boxster S to the dealership. They have reported they cannot find anything that is draining the battery but clearly it is. Has anyone else suffered from this problem and can give some pointers please?

Thanks

Neil
 
Are the interior lights going off when you close the doors and lock the car up?, Do the boot and bonnet lights go out when you press the switches?
 
In the manual it does say that after a week idle the alarm and remote locking systems are cut out in order to preserve the battery for starting. So, when you say it runs down, is the battery not starting the car or is it just the remote locking not working??
 
Ive had this problem about 3 times in the past three weeks, each time different competent service companies checked the battery and reported that it is OK. Took the car to an Auto Electrical Company and they have monitored the battery over best part of a week. They can find no significant drain on the battery and again checked OK.

They noticed when they first took it that there seemed to be a hiss coming from the drivers side speaker. Disconned and reconnected the battery and the sound dissapeared. They have handed back the car and asked me to call them out if the problem recurres.

Sorry I cant help, if I find out more I will get back.

Colin
 
You need to get a DC amp meter, this meter simply has a clamp on one end that you open like a pair of mole grips and put over the positive cable from the battery.
There is no direct connection to an electrical connection - it detects electrical current passing through the cable and provides a readout of the amps being drawn.
With everything turned off there should be no more than 40 milliamps being drawn - if your reading is higher than this you can start by pulling individual fuses to eliminate circuits.

The most common reason for this flat battery syndrome is the alternator. (if no lights etc have been left on or aftermarket audio equipment fitted)

Inside the alternator there are diode packs (3) a diode only allows electricity to travel one way - when 1 or more diodes go bad they allow current to flow in the opposite way - the alternator then tries to behave like an electric motor - It draws current - Of course it cannot turn because the drive belt is connected.
This will flatten the battery very quickly as it draws a significant amount of current.

You battery is new and tests confirm the battery is good, you can either try the pulling fuse malarky first or if you dont have access to an amp meter just disconnect the alternator for a few days - or whatever time period your battery would go flat - obviously dont use the car during this disconnect period - Then reconnect everything back up and try to start the car - If this works then it confirms it is indeed the alternator
 
When I had a simillar problem .... it was the Ignition Switch

The Car should go through a number of timed 'shutdowns'. If it thinks the key is still in the ignition, it won't shut down.

I should have realised something was up when the computer used to report 'ignition key not removed' when clearly it was

Tim
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top