Ran a 12 gauge ground wire from the main battery to the terminal strip in the bottom of the instrument pod. Ran a second 12 gauge ground wire from the starter ground bolt to the terminal strip. Ran a short braided ground strap from the terminal strip to one of the pod mount bolts and filed the powder coat down to the frame under the nut.
Installed a 14g wire from the starter solenoid to the starter switch and one from the terminal strip to the other side of the starter switch.
Made up a short wire from the backup battery to the terminal ground strip.