1997 gtx 5 amp fuse blows

I have three seadoos I’m having problems with. The first is a 1997 seadoo gtx that the engine block has one volt. It’s getting the one volt from the magneto cover and unplugging it with resolve the volt issue. But it needs to be plugged in to run. I’m thinking I need a new magneto cover? Any...

1997 Seadoo GTX MPEM Transient Suppressor Diode (MR 2535 ) defective after jump start. Blows 5A fuse in MPEM instantly. I am trying to replace the diode but I am not sure where it is. I believe it is adjacent and to the left of the 15 amp fuse. I have included a picture of the MPEM and an...