s type 2007 2.7 diesel manual battery drain

[Graham97]

My battery drains completely after around 15 minutes, I bought a new one and it does the same, no warning lights or low battery warning. I did have an ingress of water through a broken finishing plate on the offside rear light cluster. I have cleaned and dried the area replaced blown bulbs to no avail, in the morning I shall unbolt the earth and check that. Any other suggestions as I recently had another electrical fault and my local Jaguar dealer traced and repaired it for £850, I am determined not to go down this route again. Any ideas what else I can do?

I have spent almost £7,000 on things going wrong since I bought it 2 years ago

[Wrinkly]

15 hours ago, Graham97 said:

My battery drains completely after around 15 minutes, I bought a new one and it does the same, no warning lights or low battery warning. I did have an ingress of water through a broken finishing plate on the offside rear light cluster. I have cleaned and dried the area replaced blown bulbs to no avail, in the morning I shall unbolt the earth and check that. Any other suggestions as I recently had another electrical fault and my local Jaguar dealer traced and repaired it for £850, I am determined not to go down this route again. Any ideas what else I can do?

I have spent almost £7,000 on things going wrong since I bought it 2 years ago

Graham

Welcome to the Forum/Club and to the wonderful world of Jaguar ownership. When you mention local Jaguar Dealer I do not know whom you are referring to, but there is an independent Jaguar specialist in Somerset trading by the name of Swallows Jaguar. They may be cheaper to deal with than a Jaguar Main Dealer.

 I also know , only too well , what you mean by spending money on an S-Type.

Beat Wishes and Regards, John

[Jimbov8]

To drain a battery that quick would require a huge amount of current. I suggest you do not connect another battery until you have carried out some fault finding.

Main cables, spare wheel well, front water drains and then the various modules.

[Graham97]

4 hours ago, Wrinkly said:

Graham

Welcome to the Forum/Club and to the wonderful world of Jaguar ownership. When you mention local Jaguar Dealer I do not know whom you are referring to, but there is an independent Jaguar specialist in Somerset trading by the name of Swallows Jaguar. They may be cheaper to deal with than a Jaguar Main Dealer.

 I also know , only too well , what you mean by spending money on an S-Type.

Beat Wishes and Regards, John

Thank you John

I had recently became aware of Swallows and will be paying them a visit. I have been educating myself through all the past articles on the s type, today I thought I had solved the problem when I disconnected my phone from the parrot (which I dislike and removed from my un-sophisticated movano van} and the voltage went up from 12.2v to 12.8v, I them went for a long drive and stopped at an out of the way pub for about half an hour the voltage was showing 11.5v but it started ok, visited my local printer for another 30 minutes and drove home. Left it for 3 hours and checked again, dead. Big change from a fast drain in 15 minutes so I might be on to it....

Kind regards Graham

[Graham97]

1 hour ago, Jimbov8 said:

To drain a battery that quick would require a huge amount of current. I suggest you do not connect another battery until you have carried out some fault finding.

Main cables, spare wheel well, front water drains and then the various modules.

Yes, it is a huge drain and !Removed! frustrating plus I am not mechanically minded either....

[JOE-DOT-COM]

hi

the only thing that can drain the battery in 15 minutes without catching fire is the alternator, anything else would catch fire.

if its a 100Ah battery that means 100 amps for 1 hour, so 15 minutes means around 400 amps

the alternator has 6 large diodes, when when they fail short the battery out, as its always connected

if you can feel the alternator I bet its gets hot

only other item is the battery lead, from the battery in the boot to the front of the car, but would expect some smoke

cheers

Joe

[Graham97]

1 hour ago, JOE-DOT-COM said:

hi

the only thing that can drain the battery in 15 minutes without catching fire is the alternator, anything else would catch fire.

if its a 100Ah battery that means 100 amps for 1 hour, so 15 minutes means around 400 amps

the alternator has 6 large diodes, when when they fail short the battery out, as its always connected

if you can feel the alternator I bet its gets hot

only other item is the battery lead, from the battery in the boot to the front of the car, but would expect some smoke

cheers

Joe

Thats interesting, I had not thought of that as it is charging the battery. I am wisely disconnecting the battery when its not in use now and will be going to a specialist to check it out.

Thank you Joe