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Matt
Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 21851
Experience:  BEng hons Mech engineering, in auto industry 22 years
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After about 1 week left in Garage. The battery on my 2002 XKR100

Customer Question

After about 1 week left in Garage. The battery on my 2002 XKR100 is completely flat.
This has happened several times. I have had the current drain on the battery checked and it is less than 500 milliamps with everthing switched off - Help, Roger
Submitted: 1 year ago.
Category: Jaguar
Expert:  Shantal-Mod replied 1 year ago.
Hello Roger,
I'm Shantal and I'm a moderator for this topic.
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Expert:  Shantal-Mod replied 1 year ago.
Hello Roger,
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Expert:  Shantal-Mod replied 1 year ago.
Hello roger,
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Expert:  Matt replied 1 year ago.
HelloI'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. Next I'd check the current drain aspect, the best way to find what circuit is causing the excessive currant drain is to fit a current sensing multimeter in series with the positive battery lead on the car and the battery, or use a current clamp meter on the battery positive cable. A typical current drain with everything off and un-alarmed should be around 0.05Amp , so the 0.5A is far too highand 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 wiring connections and plugs to components and the wiring harness that runs by the engine bay 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 secure and the contacts are clean and bright. if the alternator appears not to be working - take it to a electrical specialist and ask them to test it as sometimes you can replace just the diode pack and this 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 1 year ago.
Hido you still need help?Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you