I have this problem with my cars antenna, and when I removed all the interior panels to see what was wrong with it, I notice that there was a cable hanging out loose and I try finding where it goes but didn't find anything so my question is where does this cable goes connected to? I post a pic if needed.

 

Can you post a larger picture, please?
It's impossible to read the text in that pic.

Also, it'd help to know the color of the loose wire.

 

The text only say that this is the wire I found loose and the color is black.

 

If it's a white cable with gear teeth on one side then it's the antenna cable. If thats the case then just disassemble the motor assembly and remove the whole antenna mast and cable and replace with a new one when the motor is installed in the car.

 

No is not the mast, everything works but it just needs power in order to work so I think that that black wire in the pic is the one responsible for it.

 

Just judging from the picture, it appears somebody may have used the power feed for the antenna to possible turn on a stereo amp. Have you checked all the related fuses?

 

Stated previously, what color is the wire? Plus I can't even see the image at all so maybe you should upload it on tinypic or something.. That might do you some justice.