Dual Battery Conundrum!

I have purchased the POLARIS BACKUP AUXILIARY BATTERY KIT (P/N 2878206) and I’m having trouble installing due to very poor and confusing instructions. A friend is an electrical engineer and he had problems trying to figure this sucker out!

Would anyone happen to have a wiring schematic or better instructions on how to install this device?

I have two RZR 800’s – a 2011 and a 2014. Trying to install the kit in the 2011 first, then if successful, will purchase another for the 2014.

Thanks in advance.

Bloisy D