Originally Posted by bljones
I am surprised we haven't heard from Mainesail on this.
This is simple all you need is a 12-10 GA TO 8 GA step down butt splice. They are red color coded with a yellow stripe on the 12-10GA end.. They can be ordered on-line but you'll need a crimper that can do 8GA, which is rather rare. Pro's Kit makes a nice crimper with detachable crimp dies you can buy and they make a head for heat shrink crimps that has 8GA...
PLEASE do not solder or twist the wires together or use wire nuts.
These wires are connected directly to a bank that likely has well over 3000 short circuit amps....!!! ALWAYS fuse this wire as close to the + battery post as possible...
12-10GA to 8GA Step Down Butt - Heat Shrink