|1995 Jaguar XJR Dead Battery "Possible" Solution:|
From inside the vehicle OPEN the Hood.
With the Hood Opened, standing at the left, driver-side quarter panel) position yourself so that the sideview mirror is just to your right side.
Look down into the engine compatment, just passed the plastic panel at the engine compartment firewall.
You "SHOULD" see a Black Rubber Boot that covers a Screw with a Nut on it. This Screw and Nut "IS" the vehicles "POSITIVE" connection to the positive battery terminal.
This POSITIVE connection is where you will clamp the POSITIVE (RED/YELLOW) connector of your power source using either Battery Jumper Cables or Battery Charger Cables.
Carefully work to slide back the Black Rubber Boot OFF and out of the way of the POSITIVE battery connection Screw and Nut.
Clamp the POSITIVE (RED/YELLOW) connector of your power source...either Battery Jumper or Battery Charger Cables) to the POSITIVE battery connection screw/nut.
Locate a GROUND SOURCE inside the engine compartment. A good ground source is BRACKET/BRACKET BOLT that attaches and connects to the frame/body of the vehicle. (I found and used the heavy BRACKET BOLT right next to the POSITIVE battery connection Screw and Nut)
AGAIN: Ensure your vehicle GROUND SOURCE is attached to the frame/body of the vehicle....BE CAREFUL.
Clamp the NEGATIVE (BLACK) connector of your power source which can either be a Battery Jumper Cable or Battery Charger Cable) to the GROUND SOURCE/BOLT.
Plug in, Connect and Turn on (to energize) your power source.
You should receive power to the vehicle to open the Trunk and access the Battery and also turn on the vehicle lights.
Once the vehicle is started and running smoothly, turn off the power source, disconnect the jumper cables in the reverse order that they were connected.
Disconnect the NEGATIVE (BLACK) connector then disconnect the POSITIVE (RED/YELLOW) connector. As you disconnect them, be careful not to let the dangling cables fall into the engine compartments or touch each other.
Note: You may need to re-charge the battery for awhile to enable you to start the vehicles' engine.
Have your Battery Tested/Replace soonest.
Hope this helps...