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Getting started in car electrics and was examining my fuse box when I noticed this short wire with a spade connector at each end. Can anyone tell me what it is, what it's for, and if it's some sort of dodgy lash up? The diagram inside the lid says this section of the box is not used.
Its a relay plug, so whatever it goes to has been set to always on
Without knowing make/model we cant say what it is for. there should be a diagram on the underside of the lid
Well if it is a relay plug shorted out (so always on) - what stops working when u pull it out? 
Maybe another relay plug buggered up so around the back of the box they are wired together so as to use the vacant position for the first relay, then somebody shorted it out later when the relay itself died??
It used to have a two-way, and it has an aftermarket stereo installed. Will just leave i alone i guess. Used to be an electricians van so god knows what they were up to.
Yes it is AC. It looks like you are right. Here's a better pic of mine. I wonder why they didn't want a fuse there? Installed an inline one somewhere else?
I think the jumper wire was fitted in the factory.
Not all models of cars, utes, 4WDs etc come with the same options.
In some models the jumper wire would have a relay in that position to operate something which is not fitted to your model.
If you take it out, something will not work, only you might not be aware of what it is.
It could be something as simple as the radiator fan control for the aircon. In australia, it's quite common to have the fan come on as soon as the aircon is turned on. In cold countries they only switch on when things get really hot, and that is done via a relay.
I would just leave it alone,.. well, maybe I wouldn't because my curiosity would get the better of me,.. but it probably wouldn't do me any good to fiddle with it.
As I have nothing sensible to say about the actual wire in question, and it appears that the brains trust has established the nature of the wire, I would like to make a general comment.
The conundrum ikw777 faced is the reason that I generally avoid anything that can be considered 'handy'. It has been my experience in the past to tackle all manner of tasks in the expectation that I can fix or improve something. I generally end up with a bundle of confusion and an expensive mistake that needs someone mildly capable of routine skills to fix for me. I now prefer to look, mutter and move away.
It is a symptom of the modern man, but there it is.
funny and very true
Its referred in the industry as a bridge.
The red wire means its a Positive bridge ( if permanent depending on who has installed it. ) .
Possible that the relay or the circuit is defective someone ( with knowledge) had bridged the positive on the relay for fault finding or for there own beneficial/industry specific reasons. Without the wiring diagram I wouldn't eliminate the car manufacturer. ( could be from motherland.
Just check your master aircon fuse make sure its the right amps. (mabe located under bonnet) and make sure its not been tampered with.
(ac2) ( don't know where ac1 is?) 30a make sure its a 30a and its all good nothing to worry about. (ac not drawing over current)
