Buddy’s daughter bought a brand new watercraft. First couple weeks it started losing power and cutting out. Battery cable was loose. So much for a pdi.
I can see a loose nut on alternator. If you have ever tried to remove the nut on some, something is on the edge of getting destroyed. Always too damn tight. I try to get them tight, but not so much you cant get it apart later. That is the possibility of not getting it tight enough.