2005 XJ8 got cancer in Dec 23, so haven't started jag since. I get around with walker so it's hard to get into back seat and take things out. Key unlocks door but under button on boot I put the key in and it turns but doesn't pop the boot.
tried under the bonnet to use the terminal at top of fuse box and a grounding nut. It did not provide enough volts to pop the boot. As I can't get under the car to look for terminals. Is there any way else to try?

 

wrong group. Your jag is a X350.

 

idk if it’ll work on your x350 but on my x308 there is a latch inside the trunk lid where the license plate goes, its pretty difficult to get but you need to lift up with a long thin flat head though the bottom right screw hole with the tip near the middle of the boot . I had closed the trunk with the battery out.

 

His profile says 2002 Jag x-type 2.5 4dr however,
maybe he has another Jag with that issue.

 

I'm not positive but I think that only works with the screw locations for the larger European plates and not the standard NA ones?

 

Connect a battery charger to the fusebox terminal and give it some time to bring the battery voltage up.

 

Confirmed works on NA models mine is canadian

 

This, or if the battery is totally dead then a jump pack set to boost.

It's how I got in mine when the battery had died & gave out about 1.1v so the charger wouldn't see it.

 

I drilled a hole behind tag and saw the cable for trunk release , pulled on it and trunk popped open.
recharged battery and we are good
thanks guys

 

I think I would repair the boot latch key mechanism immediately.