Hi,
Today (about an hour ago, actually), I went to start my 2000 Jaguar S-Type. It started this morning; however, when I tried to start it, all the electrical systems turned on and worked, but the engine wouldn't turn over and start.
I called my mechanic, and he told me to disconnect the negative side of the battery, leave it off for a few minutes, and re-connect it; however, upon trying this, it didn't work.
After scouring the internet for a while, I found that jaguars can have a pretty severe battery drain. I was wondering what you all thought the problem could be.

Thanks

 

I've moved your post from the General Tech section to the S-Type section for better visibility and responses

 

Thank you!

 

They only have a severe drain when there's a fault or you've turned the ignition on and keep it that way for a while without running the engine. Sound like your car?

Do tell us fuller details. all we know is 2000......

 

Well I don't think that there's a severe fault; however, I did JUST buy the car. And no, I didn't leave it on all night. Wish it were that easy :/

 

Can you return the car?

I think you are starting out very badly!
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It's probably something quite simple. First check the battery voltage, keep the meter on the battery while somebody tries to start the car. You should see the voltage drop to maybe 11 volts or so. If it does not drop at all then the starter is not being energised, if it drops to well below that then you most likely have a dead battery. If the voltage does not dip then you need to check at the solenoid to make sure it is being energised when a start is attempted. If you don't see +12 on the thin wire then first suspect is the lock out switch on the gearbox - assuming you have an auto? If you do see 12 v do you hear a click from the solenoid when 12 v is applied to it? if so then the starter has gone awol. You need to work through it methodically, another possible culprit is the ignition switch. If you are real careful you could apply 12v to the starter solenoid via a jump lead, see if it turns over then.
Let us know how you get on.

 

Another quick check is to try putting it into neutral in case the shifter is out of adjustment and it's not detecting that its in park. Move shifter around when it's in neutral and see if the starter kicks. Many a time I've been stuck by a car with a incorrectly adjusted shifter or safety interlock switch.

 

Additionally most electrical systems will work at 10.8 volts...the exact voltage of a battery with a single bad cell. This will not start the car...and the horn will sound with failed attempts.

 

I have a 2000 S-type and have the same issue that once in a while the car will crank and not turn over (and has even stopped running while driving). I have to open the fuse box in the engine compartment and push/tap/wiggle the green square fuse #18 on the top right and the car will then start.



I tried putting swapping the cartridge fuse and using some di-electric grease it for a better connection but that doesn't seem to help. I think there may be a loose wire under the fuse box or something.

Probably not your problem but worth a try.

 

I had a similar issue with the fuse for the cooling fan. Remove the suspect fuse, clean contacts on both fuse and fuse box with electric contact cleaner like DeOxit D5. THEN take a needle nose plier and slightly "rough up" the contacts a bit. Fuse will then make better contact.