The Main battery was not charging, so we replaced the Alternator.
A few different options, but we need the 200W version, to support the (2) cabin gel batteries.
https://www.amazon.com/gp/product/B001C625H2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
**(The Belt Tensioner was also replaced)