No battery juice

[Mr.Jack]

Had a new soundsystem installed in my truck by a professional installer.
But if the car is not used for a week or so, the battery is empty. This never happened before the new stereo, sub, amps and loadspeakers were installed.
I see he has connected a wire directly to the battery.
How should I fix this? Did he do something wrong?
Thanks.

 

[Mr.Jack]

I guess this is not a challenge and is pretty basic for most of you, but I really need help.

 

[Gzes]

Did u get subs installed? If so then the wire u see is the amp 12 volt wire

 

[Mr.Jack]

Yes, sub is installed. Everything is new.

 

[steven johnson]

take it back and have him fix the problem, since you payed good money for your system.