Ok well I just got my battery so im finna go get the wood to build me a little amp/battery rack...the location of the battery will be right next to both the amps so I was wondering would it be better to run the negative grounds back to the battery or keep them on the chassis spots I have them??? I was also wondering about the use of fuses...I know im gonna need to add more but i was wondering is the 3rd fuse on the 2nd wire after the 2nd battery really neccessary as the amps have fuses???