Our 80 amp is a direct replacement with zero wiring and or brackets needing modifying. On any Yanmar 6LP marine diesel engine with twin crank pulleys (dual 3/8” alternator pulley) you can only replace your current O.E.M. alternator with this specific unit or our 155 amp version. This is because the guard and tensioning arm need to be replaced with custom components to make any other manufactures marine alternator fit. Hot rated output idle 22 amps, fast idle 31 amps maximum 83 amps Dollar for dollar, upgrading your alternator may be the best project you can undertake on your cruising Yacht.