The fuse & wiring in the following diagram are for a 3G alternator. The stock alternator uses a dark green fuse link wire that connects to 2 black/orange wires. Always leave them connected to the starter solenoid even if you have a 3G alternator.
Hatch car. Ground is bolted to rear seat stud in the rear. I have a four gauge wire from the timing chain cover to a bolt for the sway bar and a replacement ground strap on the rear of the motor to the firewall. 3G upgrade and it works fine.
rear quad shock mount
U can use a ground strap from block to frame rail also
If I throw the charger on the car runs great but seems to slowly drain affecting performance.
I'd run a dedicated ground from the block to front subframe. From your posts, it doesn't seem like the battery is grounded at all to the rear subframe. I don't suppose you have to but most guys, when battery's back there, the neg. terminal goes up front like yours, but is also connected to ground back there. Also up front, you're grounded to the front body, but not the front subframe. Sorry if I missed somethingThe ground goes from the battery to the wheel well and from the wheel well it runs to the block. I'm using something on the passengers side that might have been used for old egr stuff or something for the ground location. From there I continue, now with a 4g wire to the "pigtail" where the old battery was.