08 XK Limited will not start.

[mrnavy2]

Ok, here is my problem. Last weekend did a tune up on a 08 XK Limited. It ran beautiful after replacing the upper plugs. After a few days of driving it and enjoy how she ran, I parked it at home and the next day went out to start it and it would not start.
What I get when I turn on the key: I get a small click. My friend listened to where the click was coming from. It was coming from the back fuse back. We opened up the fuse box and start to check everything. When we heard the click again, it was coming from the group of 3 relays. Everything lights up on the dash. Windows go up and down, Radio and AC still work.
I also checked the battery and it was 12.5 volts. Still good, but it will not start. We also try to jump start it to satisfied ourselves and still nothing.
Anyone had this problem or heard of this kind of problem on a 08 XK.. Thanks for your help. Steve….

[07JeepXK]

Did you try jumping it off of another vehicle with jumper cables?

[NeilSmith]

battery. trust me, battery. jump it and see if it will start. lots of talk over the past few years about the batteries. you cant trust the battery testers neither. also could be wire running to starter, if it starts by jumping it then ts the battery.

[07JeepXK]

Its not the battery! He posted on the other forum. They tried to jump it off his friends truck. Still wont start. Doesnt even turn over at all but all the lights qork, windows go up and down...etc. Im thinking starter..

[NeilSmith]

then starter or that stupid wire down there. Its not the battery ! HaHaHaHa !!

[Matt]

Steve, put a voltmeter across the battery and see what the voltage drops to when you try starting it. If the voltage drops, its likely the starter. If the voltage doesnt drop, its the wiring and/or relays.

Want me to take a look at it tomorrow AM?

[Matt]

Just an FYI, since you told me it didn't start a few weeks ago but then randomly started working again.... I have a feeling its corrosion on the wiring harness.

[DetroitMarauder]

I'd say wiring harness too. Mine had the same problem. It didn't start once or twice then started fine a few minutes later until one day it wouldn't start at all. It's a known problem because the mechanic at the dealership walked out to mine, popped the hood, reached in and jiggled the wire, hopped back in and started it to drive it into the shop. He parked it right next to another XK that was there for the same thing.

[mrnavy2]

@Matt. Use that would be good or even in the afternoon. Up to you. Just let me know what time so I will be home. Thanks brother.

[Matt]

text me your address. i'll swing by in the AM after i get some coffee in me. (~9-10)