Non starting jaguar

[Bellasim]

Hi everyone thanks for your reply’s,

let’s start from the beginning the first time it happened I opened the car and every thing lit up like normal pressed the brake and pushed the start button, the ignition lights came on like normal but I got a click when the engine should fire like a sticking starter or a flat battery. After some swearing eventually it started. Now when it did it the second time I had no luck in actually getting the car to start so we proceeded to use a booster pack, the booster pack we used is a 1500amp beast that my friend has used to start a wagon before. Now before we used the booster pack the interior lights were working and ignition was coming on like normal and after using the booster everything is now dead. Since getting the car transported home where I could work on the car stress free because originally I was stranded away from home and I had work in a couple of hours. I checked everything in the boot that I could, all the fuses tested fine and all the cables were tight but I found 2 corroded plugs on the rear bcm. I have cleaned the pins and plugs but it has made no difference also the battery that had been fully charged to 14.4v had drained down to 2v whist being still connected to the car for a week and now it won’t take a charge I could only get it too 9.5v last night so I would say it’s goosed. 
I’m purchasing a new battery and if that doesn’t help a alternator as mine was fitted in 2018 and I have seen so many comments on how these cars eat alternators plus I’ve read a story of another xf acting exactly the same as mine and the alternator had burnt out causing such a draw from the battery that there was nothing left for the rest of the car. Also I’m going to check the front bcm and all the wiring in the drivers wheel arch as I believe there is an earth wire in there. Perhaps a new battery is all it needs and we finally killed the battery with the booster pack I just don’t know, I’m fed up of this car as much as I love it I really wish I never bought it. 

[LairdScooby]

3 hours ago, Bellasim said:

the battery that had been fully charged to 14.4v had drained down to 2v whist being still connected to the car for a week and now it won’t take a charge I could only get it too 9.5v last night so I would say it’s goosed. 

Sounds like it's lost a cell or two. That's the usual sort of figure i would expect from one dud cell.

3 hours ago, Bellasim said:

the alternator had burnt out causing such a draw from the battery that there was nothing left for the rest of the car.

Disconnect (and insulate) the battery lead from the alternator and unplug the warning light/field wire so the alternator can't generate then try a fersh battery. It's possible if the alternator is dead and shorting the battery, it's what killed the battery or maybe even vice versa.

3 hours ago, Bellasim said:

I’m fed up of this car as much as I love it I really wish I never bought it. 

Once you get past these problems, you'll be glad you persevered. 😉 😄

[Big John]

9 hours ago, LairdScooby said:

Once you get past these problems, you'll be glad you persevered. 😉 😄

I Agree, these are great cars and well worth the effort they require from those of us who love them 🙂

13 hours ago, Bellasim said:

...when it did it the second time I had no luck in actually getting the car to start so we proceeded to use a booster pack, the booster pack we used is a 1500amp beast that my friend has used to start a wagon before. Now before we used the booster pack the interior lights were working and ignition was coming on like normal and after using the booster everything is now dead.

Slightly worried about the " used to start a wagon before" and "after using the booster everything is now dead".

I hope the booster was set to 12v not 24v......😫

Good luck

[N6 JMX]

Please note that when you replace the battery, you will need to "tell the car" that a new battery has been installed. This allows the battery control module to reset the alternator charging rates. This is achieved via the OBD port and a plugged in suitable code reader, which most garages should be able to undertake.

N6 JMX

[Bellasim]

Hi every one I’ve got some good news the alternator and battery have brought the beast back to life. I would like to thank you all for your help. I’m a happy bunny again 

[LairdScooby]

Glad to hear you've solved your problems and normal service is resumed! 😉 😄