The following kit is a "bolt for bolt" replacement for the standard alternator on a Yanmar diesel. The kit features a Series 23 Powerline alternator with a dual foot mount and 7.1" bolt to bolt layout. The kit includes a smart three step regulator (10-199) with Bulk, Absorption, and Float modes, turn-on delay to protect belts, and many other features that are intended to optimize charging of expensive batteries. The kit includes a wiring harness (11-80) and instructions. Alternator pulley is not included and must be purchased separately. to meet your specific drive need.