2002 XKR,runs great and no problems....ran some errands,parked in the garage and then went back to retrieve items from the trunk.
Everything was dead....no interior lights,horn ignition.Battery is fine.
Thought I might have accidentally triggered the valet key but nothing works....also checked the battery in the remote.Could be driver stupidity but I'm stuck.

 

Any chance either the ground or the positive connection to the battery terminal has come loose?

 

My 2003 XKR has done the same thing to me, shut down after a long 2+ hour run with no power functions. I tested the battery and found no faults with 820 CCA remaining in a 850 CCA battery. When it happened two years before the latest I removed battery cables and tightened them, problem gone for two years. The latest failure I removed the positive cable and was going to replace until I saw the $ 126 cost. Took the cable to the bench vise and squeezed the terminals, reinstalled and it's working for now. I not sure that was the problem, if it happens again I'll use a voltmeter to check power at the high capacity fuse connections, that should verify/exclude the positive cable as the problem.

 

Thanks...good tips.After 24 hours,everything was restored......I opened the door,lights came on and it started fine.
Definately going to my mechanic to figure this out.

 

Not sure if I needa mechanic or an exorcist

 

An exorcist is probably cheaper. Did it fail to start again?


Before spending money on this maybe try the following ... See if you can feel any looseness as you try to twist the connectors on the two battery terminals.

Even if they feel OK this way, snug them up with a wrench. Or, better still, remove each lead, clean everything up and reattach.

 

Thanks everyone....problem was battery cables.Cleaned,tightened and all seems good.

 

Sir I've been around this block multiple times.

Both of your cables should be replaced now and you need to clean the mega fuses for the positive cable.


I would buy the cables and instal yourself. The arcing created internally by the bad connectors creates heat,noise and damage unforeseen by the naked eye to the internal wiring material.

Failure to do so, will result in a very expensive alternator and possibly module failure or reprogramming, and I would hate to see you have to go through this.
Have the battery tested as well, a bad cell could of also been created.

 

Appreciate that tip...going in for service soon and will have that taken care of.