took this from crutchfield...this should help you out a bit



that pic uses a ground block..i have a cap installed as well.. i got my power going from battery to cap, and cap to MONO amp..and i grounded my 3 things..(cap, 4 chan, mono) to the same spot and it's been workin great, no hissing or anything from speakers..i dont like using ground blocks..if its not done right you can get gay ass noise through your speakers..if you can get a good ground point, it should be fine.. oh and if ur gonna buy a wiring kit that's fine, but if you decide to buy just cables and diy..don't get seperate fuses and distro blocks..get a fused distro block..you can get a knukoncepts for $20 from ebay..