Power and ground are linear connections when done this way (well they’re linear in thie circuit in any case). Here we go...all wire is OFC copper, full big three under thehood added to exxisting wire, all real AWG wire. I have 1/0 awg power from front to back, 2/0 awg from back to the front. Instead of grounding everything off the chassis in the back (given that it is a unibody car) I just use multiple distro blocks as splitters to route power and as reverse splitters on the ground combining the grounds back into the 2/0 ground run (think of it like using power distro’s in reverse). Picture both wires going from the front to the back where the 2nd (1200 watt AGM) battery awaits. Fuses for the 2nd battery are in-line prior to (within 18” of) the 2nd, battery in the back. Then a small section of cable to the battery using 2/0 to 1/0 reducers where needed on the ground side and straight in on the power side. A single 1/0 to dual 1/0 Stinger battery terminal splitter connects each cable to its respective terminal. So, we now have cables running from front to back, back to front, 2nd battery fused (+) and (-). From each of the stinger terminals remaining single 1/0 open connection, I run a single section of 1/0 from the battery, about 14” long. Now, at the other end of those 14” runs, I connect a single 1/0 to double 1/0 splitter giving me two 1/0 outputs (or inputs for the grounds as you will see later). Let’s cover the power line first. From one of the two 1/0 block power leads, I connect a single 1/0 to double 4awg splitter which feeds 4awg to the two T-spec caps, then to inline fuses, then to the two Focal FPS 2300’s ,The other power single 1/0 power lead goes to my 5 farad stinger hybrid cap, then to a fuse then to my DS18 EXL 2500.1D. Now, for the grounds. I now have 6 grounds to contend with (3 for the amps and 3 for the caps). Four, 4awg’s from the two caps and two amps and two 1/0awg’s.one from the stinger cap and one from the Mono amp. I run both of the1/0 grounds back to a dual 1/0 to single 1/0 distro block, run that 1/0 to one of the two open ground connections i split earlier. I then run all four 4AWG grounds from the caps the amps, to a quad 4awg to single 1/0 distro block. Then, from that single 1/0 off that block to the other 1/0 input on the ground splitter from the ground battery lead. Done!
Easy-peasy right? Clear as mud huh? Don’t fret; I had to draw it out, almost to scale just to order all the stuff! I’m going to have to draw it out again and take picture so I don’t have to explain this anymore, hurts the brain!