RFI MPEM 5A Fuse blows - problem found
- Thread starter waiteman1
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In my case it's happen in middle of the lake with half engine load. I fix it and now it's work! There is some photo. I find reason why this happen. It is one fuse in high voltage box. It get water and start burning and as result connection impedance goes up.When engine work, battery work as big capacitor. When connection lost MPEM get high voltage spikes from generator. My suggestion is check this connection before replace or fix MPEM. Many thanks and good luck!
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LivAlittle
New Member
Does anybody have pics of the old style mpem? The 278-000-821 family? With just the plastic backing and rubber/potting on the top? Im having the same issur with a used ski and not sure where the diode is located.
With the wires to right, exactly between the two fuse holders, but next to/in front of them. The MR2535L diode is directional, big & round, circular stripe on left side, just like the picture in post #62 of this URL:
http://www.pwctoday.com/showthread....ighlight=mpem+secrets+revealed+for+first+time
95GTI Owner
New Member
Want to let everybody know that the diode replacement went fine on my ski. I sealed it up with silicone calking and re-installed the MPEM with a new 5A fuse and started right up. This was back in July, but I didn't write about it because I have new problems now. After replacing all the fuel lines and cleaning fuel filters, I was about to rebuild my twin carbs. Carberator mtg bolt is frozen (afraid to heat with a torch - boom). Thats when I discovered that all 4 engine mounts were broken too. I gave up in dispair but I'll fix it for next season.
Someone here at the site had a set OEM for sale. Not sure of the fit but worth looking at. Also, another member sells better than OEM quality aftermarkets as well,,,
LivAlittle
New Member
well i ordered my diodes. should be here this week. i will keep everybdy updated. thanks again.
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LivAlittle
New Member
Update! Got two diodes, installed one exactly like the old one was. Bam still pops the five amp fuse when the stator is plugged in. If i unplug the stator and run a ground from the negative batt T to the ground post on the ebox it still blow the fuse. Help? I beleive the stator tested normal as per the service manual. Any ideas would be awesome. Ill even PM you my phone number if it makes it easier to resolve this issue since the wife is breathing down my neck...lol
LivAlittle
New Member
Ok, ill pop the flywheel off this evening and lookin into ut. Hopefully find something. Its a 587 engine as well. Its a 94 gtx hull/ ski with a 587 sp powerteain. Also im confused about the fact that if i discounect the stator and run a ground from the battery to the mpem the fuse still pops. Would that mean its not the stator?
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LivAlittle
New Member
I may need to find an entire grey box with all the goodies in it and swap it out and see if i can get it worked out.
Can you send those pictures ...THANKS Ed echampagne@charter.net
What was the diode number that you bought? I have a 2004 GTI LE.
QUOTE=mmuzzatti;212257]All,
Read this forum...I just did it and fixed it! I bought the diode from Amazon.com. I thank you for saving me $400.00! If anybody needs directions I would be happy to walk you through it.[/QUOTE]
QUOTE=mmuzzatti;212257]All,
Read this forum...I just did it and fixed it! I bought the diode from Amazon.com. I thank you for saving me $400.00! If anybody needs directions I would be happy to walk you through it.[/QUOTE]
Tallmanneal
New Member
Hi, I have a 278-001-496 mpem that is blowing the 5A fuse, I want to replace the diode but wanted to know where on the mpem do I remove the potting material to access it. How did you do it?
Thanks!
okay new to the forum, and not sure if this is where i want to post but i am having similar issues as everyone else on here. I have a 96 sea doo spi and i was jump starting it because the battery was weak and sure enough the 5 amp fuse blew, so i put a new fuse in and it started up out of water twice, dropped it in the water and started it and pop...fuse blew again. i switched it one more time and tried it again and the fuse blew again. so i read around on various forums and decided to pull my mpem because supposedly a bad diode is a common issue, i cleaned out all the black filler and found the diode and tested it only to find that it is still good (according to my multimeter). What do i do next???
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