1998 Seadoo GS Popping Fuses

[One40ozBUICK]

I purchased a 98 Seadoo GS with a lil problem. It was a good deal and the Seadoo looked new so I figured worst case I'd build the baddest mail box on the block. The lady I bought it from said the shop told her it was at least a $250+ computer part plus labor to repair it. Here's what it does. I put in a new battery and nothing. I checked the fuses on the mpem and the second one from the bottom which should have a 5 amp fuse has a 30 amp fuse. Now the bottom fuse which is a 15 amp fuse was popped. I replace it and instantly it pops. What might cause this? Do I need to replace my mpem? Also heard about guys fixing these, anyone know anything about that? Or some where I can get it repaired or another one. Also on the mpem the numbers stamped on it are 278 000 930
But on the back there is a sticker that reads:
Serial # E0085900008Z
Manufd- 2003/06/23
Client # 278-000-916
Hard: E00851A00
Appl: R

Which one would I need and why the two numbers? Help!

 

[Dr Honda]

Disconnect the trim motor. It may come back to life... but chances are, someone tried to "Jump Start" it... and roasted the computer.

 

[One40ozBUICK]

Kinda new development, I removed all fuses and installed correct one in and now the ones on mpem didn't pop. Nothing. Then checked the fuse in rear electrical box of seadoo and it was a 30 amp fuse that was popped... I replaced it then a second or two it popped aswell. The one up front still good so far. Now do the ones that say spare on thmpem need fuses if so what size? Thanks

 

[Minnetonka4me]

No they are spares. you need to completely disconnect the VTS and see if it keeps blowing fuses. If it does, you need a MPEM.

 

[One40ozBUICK]

Well I know If I didn't need a new mpem I do now! Replaced the fuses with correct ones and it stopped popping but still no beeps or anything. Then saw the fuse in rear elec box had a blown 30amp fuse. I replaced it and it popped. looked up where that fuse goes and noticed it called for a 15 amp fuse. I didn't have one handy but had a 10 amp(I know still not a 15) but figured it was less and wouldn't hurt. I plugged it in and heard a lil sizzle and smoke from mpem The fuses weren't popped so I removed it and found a lil spot where I burned on the rear of the mpem. That's my luck! FML! Now wondering if i put a new mpem would it fry that one too?