Battery relocation

Did you route down the pass side, and go thru the firewall there?
EDIT: I guess the starter is just on the other side of the floor there.

Standard lead acid batts are easier to care for, and keep in good condition. sla or agm batts are finicky, and neither types will deal well with our charging system hitting130A of charge current. It just makes a standard one need water,lol.

When agm batteries form bubbles, the bubbles can't move, and it decreases the cranking amps, or total power.Same thing with gel cells.Bubbles in standard batts just float to the top and pop.

MSC and mcmaster sell a bulkhead passthru called a sealcon, and those have a rubber insert that makes a seal for water ingression protection,I use those.

That's where my amp is currently grounded. I pulled out the 2awg wire and started to get it ready to go in. I weighed the other cable, a 30' length is 100lbs. of solid copper, lol.

No, it's bolted to the bracket where the trunk arm is attached. That's also where I bolted the ground fro my amp. I get some alternator whine sometimes, and it seems to be the body connection changing as I drive. This car doesn't have any broken spotwelds like lazarus. That's why I'm considering running the ground as well. Either way, the relocation of the battery to beside the amp can't hurt. I also have a 1F capacitor I'm adding, once I get the charging circuit figured out. You have to limit the current so it doesn't explode when you hook it up the first time.

It looks good. I'm going to hit the boat place, and see what they have for battery boxes.