I need to know where a good spot to ground my stereo amp is in the rear of the S5. Thanks.

 

just clean the surrounding area of paint and any nice sized bolt in the area of the amp will do just get a good claen connection and use a quality crimp.

 

thats what i did on my s4 also , s5 is pretty much the same.

undid a bolt scatched paint off around the bolt hole, used one of those crimped conectors =O looks like that wiht the loop on the end.. and it works fine.

 

I would rather run a good ground back to the battery. You've already run power, why not ground?

 

NO nead to run an extra cable to the battery you will not gain more than say 0.3 volts by doing it so unless you are into serious award winning quality waste of time and money.