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

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.

Finally got my car home checked all the big fuses first non blown removed the rear bcm and found corrosion on the bottom middle plug. Where do I go from here and would this stop the car from starting

Spoke to a jaguar electronics expert at Edinburgh he also says it won’t be the alternator or the battery more likely a bad earth somewhere like you all suggest or the bcm in the boot.

That’s what I thought to be fair could the smell of came from the bcm in the drivers foot well 🤷‍♂️

Hi everyone a thanks for the replies, after speaking to a jag specialist where it’s getting delivered too he thinks it’s more than likely the alternator has burned out as it’s now 6 years old and to be fair a week before all this started I had a right smell of burning one day on the way to work I thought it was coming from out side or it was the road water on the hot exhaust. Fingers crossed a new battery and alternator will fix her and it last another 3 years till the cars paid off 🥴

I’ve no idea of the age of the battery I’ve only had the car just over a year

Hi again after the battery was on charge all day it was testing at 14.4v, my stop start was working before this all started so Im thinking the batterys are in good health. After fitting the battery to the car this afternoon after being on charge all day nothing happened couldn't get an interior light to come on or even the hazards absolutely nothing dead.

This was after we removed the battery and the car was acting dead. Never tested it when trying to start it. Thanks for the reply

Hi my jaguar keeps acting like it’s got a flat battery. I parked up the other day and when I came back it was flat then 5 mins later started no problem. Then yesterday it done the same thing but this time it never came back to life we have tried a booster pack on it and it will only try to start when u put it in boost mode u get a couple of turns then flat again. Thinking the battery is flat we have took it off and put it on charge but it had 12.4v in it when I put a multimeter on it so I’m confused. The battery terminals are tight I’ve checked both bcm’s the one in the boot and drivers side footwell for water damage but can’t see any I’ve not took the plugs out and looked at them yet that’s my next plan and the starter motor cable for corrosion. Any help would be much appreciated as I’m lost now.