Battery Drain XK8
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Battery Drain XK8
Hi Guys
Recently bought a XK8 Convertible 2000W and if the car is left for a couple of days it goes stone dead , I have put a brand new battery on her and had my local auto electrician to test her out, What he discovered was a slight whirring noise in the boot area when every thing was switched off and the keys out , Now he says it could be a module fault but trying to find out which one could take hours , we have been advised to take it to Jaguar and do an analysis check . Also what i have noticed is that when you take the keys out of the ignition the radio and Ariel stay on until you turn them off manually - i spoke to a friend who has the same car and his radio turns off when the keys are removed - could the control module for the radio be faulty and cause this and will the Jag analysis pick it up ?
If anyone has any input i would be grateful .
Charles.
Recently bought a XK8 Convertible 2000W and if the car is left for a couple of days it goes stone dead , I have put a brand new battery on her and had my local auto electrician to test her out, What he discovered was a slight whirring noise in the boot area when every thing was switched off and the keys out , Now he says it could be a module fault but trying to find out which one could take hours , we have been advised to take it to Jaguar and do an analysis check . Also what i have noticed is that when you take the keys out of the ignition the radio and Ariel stay on until you turn them off manually - i spoke to a friend who has the same car and his radio turns off when the keys are removed - could the control module for the radio be faulty and cause this and will the Jag analysis pick it up ?
If anyone has any input i would be grateful .
Charles.
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Joined: Dec 2007
Posts: 1,408
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From: Ormond Beach FL
RE: Battery Drain XK8
I would first attempt to locate the circuit(s) which are the primary source of the battery drain. Disconnect the positive lead and put an ammeteracross the circuit. Register the the current being drawn with the key out and everything shut down. Then start pulling fuses whilesomeone else is watching theammeter for a major change in the readings.
The owners Maintenance Manual Pages 42-48 lists the fuses, their locatations, the correlated electricaldevices. Start with any 'suspect' items; and proceed fromthere. You will probably find one or two circuits that aresuspect. At this point you at least have a general idea of where the problems are located; and you can determine what types of troubleshooting you need to perform next.
This type of fault search usually takes some timeand is not aquick fix. However,I would at least attempt to locate a drain myselfprior to turning the car over to an auto electric shop. Sending the car to adealership would be my last resort because of their high hourly labor rates and the excessivetime required to locate these types of problems. gordo
The owners Maintenance Manual Pages 42-48 lists the fuses, their locatations, the correlated electricaldevices. Start with any 'suspect' items; and proceed fromthere. You will probably find one or two circuits that aresuspect. At this point you at least have a general idea of where the problems are located; and you can determine what types of troubleshooting you need to perform next.
This type of fault search usually takes some timeand is not aquick fix. However,I would at least attempt to locate a drain myselfprior to turning the car over to an auto electric shop. Sending the car to adealership would be my last resort because of their high hourly labor rates and the excessivetime required to locate these types of problems. gordo
Veteran Member
Joined: Apr 2011
Posts: 5,008
Likes: 2,622
From: Los Angeles
It sounds more like a worn out ignition or one where when you turn off the car, the internals are not going to the off position but is staying at the accessory position which is why your radio stays on. You might check that out first, it may be as simple as lubricating that cylinder.
Junior Member
Joined: Jun 2023
Posts: 6
Likes: 0
From: Washington, DC
dead battery XK8
I understand that the anti-theft system may be responsible for the battery drain. Can that be disconnected (such as by pulling its fuse) and will that have other consequences?
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