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I recently purchased a 2004 XJ8 for my wife. I am giving it the once over and found 2 things that I can't find an answer to. (My google skills must be lacking).
There is one wire near the passenger side front wheel well that isn't connected to anything, can't see where it goes down below and don't see any unconnected fittings.
On the driver side, there is a hose that isn't connected to anything, it has a screw end. Again, I can't find any unconnected fittings there aw well.
Congratulations on your new toy. You've already learned the shocks have been converted and there's a different forum for the '04-'09 run of the aluminum body Jag sedan.
Be glad, very very glad the shocks have been converted. I had an '06 VDP (x350 with a few add-ons) and loved the air-shock ride, but hated the air shocks. The front ones were usually the first to go, and it was maybe $1200-$1500 to replace at my local gas station. They'd been replaced once by the first owner and once by me within 86k miles and 14 years before my vehicle was destroyed by a falling tree. Had that not happened I would have converted to conventional shocks at the first sign either end was having air shock problems.
Welcome to the Jaguar Forums! It's great to have you with us.
I have moved your thread from the forum for the X308 to the forum for the X350, which is the Jaguar factory project code for your 2004 XJ8. Here you will find knowledgeable owners of similar cars.
As you have already been informed, the air hoses you found originally connected to the air spring bladders, and the electrical connectors connected to the ECATS solenoids in the tops of the shock absorbers for the Enhanced Computer Active Technology Suspension, which had the ability to change the damping rate of the shock absorbers between Firm and Soft during cornering, acceleration and braking. The coil conversion kit does away with this capability but it also does away with the problematic and leak-prone air springs.