Well I finally got around to installing my second battery
using a fridge relay.

Now I want to pull out fuses 7 and 8 (interior lights and
radio on an 80), splice into the wires, install an inline
fuse (20A) and run them back to the second battery on the 12
gauge wire I ran from the second battery to the dash. Will
one 12 gauge wire handle the load of both?

Thoughts? opinions?

Thanks,
Chris