2001 Civic Big 3

The +12 is in the underhood fuse box, front-left corner of fuseblock. Alternator input is on that same edge. (I may have them backwards, but they are both on that front edge of the box. The alternator input is the fused one...) There are two #8 wires connected to the battery - white. One goes to the underhood fuse box, the other to the starter. The alternator lead runs from the alternator to the underhood fuseblock, in the harness that runs over the top of the cylinder head. In mine, it was WAY too much bother for me to attempt to remove it, it's all taped and loomed in place, so I simply disconnected it at both ends, and shrink-wrapped it... A couple zip-ties keep it hidden at each end... this also allows easier removal of all my aftermarket stuff for when (and if) I ever decide to sell the car. 4 gauge directly from the alternator terminal to the battery... lots of places to run it through and around the chassis supporting the radiator. Be sure you fuse or CB protect it! Re-built the cable from the battery to the fuse block - custom is better IMHO... Alternator will be plainly visible, but NOT plainly easy to get to... Those Japanese automakers STUFF those underhood areas TIGHT!!! Count on a couple bruised knuckles... Grounds? There is a braid from the valve cover to a point above the radiator, replace it with a #4. AT the chassis side, I scrubbed the paint, and added a dollop of electrically conductive, anti-corrosive goo... Got it from work, and I do not remember what it was called, sorry. I added two 4 gauge grounds from the battery to the chassis, one on each side of the car. There are some bolts available for this, again, scraped and anti-corrosion treated. Make certain your alternator IS THE SAME!!! A drop-in replacement will make your life MUCH easier... I had some fabbing to do. Brackets and spacers - pretty easy fabbing, but fabbing nonetheless. Alternator R&R was pretty easy, overall. Should be no trouble for you.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."