Today i was having my radio put back in since it went out for repair(kenwood flip) and when he was putting it back in i noticed i had an extra ground that wasnt attached to anything. Everything works fine and i have no problem but i was wondering if i should take it apart and ground it anyway. It was coming from the harness. He said its nothing and just let it hang there but i dont like it

 

by the way i also have a sub amp, sirius radio and i use the head unit to power the speakers

 

Many installers take the easy way out and let the antenna act as the ground. This could allow the system to be noisy.

 

What he said... and you should definitely connect that ground.

 

...just make sure it IS a ground.