Ok, the Jeep hasn't moved much last couple of weeks but always started.
Yesterday it was drained, more or less. After a 24hrs on the charger all was fine, but drained (2V) this morning. Battery is quite new.

When I hooked it up charged I could hear a hiss on the passengers side firewall..

So, anybody know what is coming on when a new battery is hooked up? Stereo? Fan? Feels like something is switched on automatitically.

 

For starters, you don't want to hammer your battery like that...Disconnect it overnight until you figure it out. Don't make sparks around it, especially charging. The fan is there. It should not get power when it's off. It has a fuse you could pull. On my 90 (ign on), the fan will stay on supper low unless all the air controls are moved to the left.

Pulling fuses might find it.

 

Yeah I usually disconnect if for longer periods but it was still a surprise.

I'll look around.

 

Good way to find prob is disconnect the ground, put a test light between the lead and post. If there is a draw the light should be on. (By the way make sure the hood light is disconnected if you have one and the fuse for dome light is pulled before you start, because the light will come on if the hood or dome light is on). If light is on, start pulling fuses till light goes out. when it does then that is the circuit to investigate for shorts.

 

Also check hood light (if you have one), make sure it turns off when held in horizontal position as if hood is closed.

 

I had this problem on my 95 XJ. So I disconnected the hood light and it stopped draining the battery.
Hope it's that simple for you.

 

Same here

 

this ...you will have a very small draw from clocks if theres one

 

True enough, however the clock most likely draw enough to light up the test light. What ever is draining the battery will illuminate the bulb somewhat brightly.

 

Edit: clock doesn't draw enough to light up test light brightly, what is draining battery will be somewhat bright.

 

Update:

Hood light is ok, turns off.

Fan is slighly on, so it pull it left, should be ok hopefully.

Picked up something in the car late evening and noticed the boot light and passenger foot light won't go off..wasn't on when I unlocked the first time. For how long should the light be on after locked?

I fixed a door hinge on left backdoor, did I f*ck up something?

 

Shouldn't be on when door is closed.
May try screwing out and adjusting the switches a bit on the frame side of the door for the boot lamps.
They may not be closing fully without slamming door closed.