i've been looking up like 5 different DIY's on the relocation. Here is what I'm working with.

-Battery in the rear
-fuse box in passenger kick panel


I have the one cable from the Alt that needs to go to the fuse box. I need to extend this somehow with 4 gauge

I have another wire that is in the wiper tray that hooked up at the battery direct and im not sure what this wire is for but i need to extend this to the passenger foot-well as well with 4 gauge.

I then need to go from the 2x 4ga wires to 0 gauge and run it out back

How should i go about doing this? Should I try to put a distro somewhere? I have 0 wires in the stock battery/fusebox location so I dont want anything there. I have the EPS in the wiper tray as well. Been trying to find 4 ga butt connectors and 0 gauge butt connectors with no luck.

 

There is a good post on this in the FI forum, lots of different ways of doing what you want. Some people put the fuse box inside the fender, by your windshield washer tank...but I like your idea of the kick panel. I think with putting it inside the fender (no fun if you have to change a fuse) the wires are long enough. But if you extend, I believe you will just need to solder them and shrink wrap.
I think you will want to put a circuit breaker in the current battery location and then run the 0 gauge back to the trunk. Hope that helps.

 

Just ran across one of the better threads: https://www.s2ki.com/s2000/topic/715...ery+relocation

 

I didn't have to extend the heavy gauge wires. But of the 2 in wiper area I rerouted black one in engine bay for extra length. Just to note everything else is in fenders except main fuse box in passenger floor. Take my advise and use cable sleeves for large bunches of wires and don't go crazy with electrical tape because the day you need to diagnose something that tape leaves a sticky mess behind.