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1994 sea doo spx no power

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lx.crowell

lx.crowell

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i am working on 1994 sea doo spx, it was working good then lost all power to everything. Cant get power back to anything anybody have any suggestions? Thanks
 
Hi and welcome to the SeaDoo forum.

Check the fuses, they are in the front e-box.

Lou
 
Checked the front e-box the 5 amp fuse was blown replaced it tried it still nothing checked my fuses again the 5 amp fuse was blown again. Leads me to believe that something is grounding out weird or shorting out any suggestions were to look?
 
That's the fuse for the MPEM, did you try to jump start your ski from a running vehicle or maybe hook the battery up backwards?

Lou
 
No the battery was hooked up correctly, started and ran just fine took it out and all of a sudden lost power to everything that was a loose ground terminal on the battery, got that tightened back down and it happened again the terminal was still tight but now I'm blowing that 5 amp fuse
 
Ive been reading other threads and it seems like it may be a bad mpem that is causing the fuse to blow, is this true, can anybody back this up or have any other suggestions of where to look? Any help is appreciated.
 
MPEMs do fail and can cause the fuse to pop. It is often the internal diode that goes bad when that happens.

However, it is very common for an outside source to be the root cause. For example, the VTS fails often and as a second issue it pops the MPEM fuse.


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Yes, that's my opinion, that's why I asked it the battery was installed backwards or if the ski had been jump started. There's a diode inside the MPEM that usually blows, I was actually waiting for a second opinion.

You can remove the MPEM send it to Nick [MENTION=41828]Minnetonka4me[/MENTION] he can test it, if it's bad he can sell you a good one at a reasonable price. If he doesn't pick up on this thread PM him.

Lou

Added: Well it looks like I got my second opinion. You know Kevin brings up a good point, try unplugging the VTS it's the connector just over the battery, red and black wires, see if the fuse still blows.
 
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usually when you have the symptoms you are experiencing, that is the cause. some of them just have the diode let go and quit working. minnetonka4me will probably have a replacement MPEM for a reasonable price
 
Ok thanks and that makes sense because the VTS has not worked i just got this ski so not sure how long the VTS has not worked, what is involved to get the VTS working? Is there a way to bypass the VTS so it doesnt kill the MPEM again? On an extremly tight budet if it can just be bypassed it would be preferable
 
lx.crowell said:
Ok thanks and that makes sense because the VTS has not worked i just got this ski so not sure how long the VTS has not worked, what is involved to get the VTS working? Is there a way to bypass the VTS so it doesnt kill the MPEM again? On an extremly tight budet if it can just be bypassed it would be preferable
Click to expand...

As Lou points out, simply unplug it for now. Lets determine if it is the issue or not. The VTS is repairable a few different ways. Can get costly. Lets do one thing at a time so we don't get things confused.


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On the MPEMs, if you can pull it out then put power and ground to the wires that have the ring terminal (580-720s)...if it pops the fuse its done for. I do have a replacement in stock.
 
I finally got to taking it apart and when i put the positive and negative wires with the ring on the end to a battery and the fuse popped instantly so should I PM you Minnetonka4me about the part you have
 
Ok have a head scratcher put a new aftermarket Mpem in the ski and got it running then when i hit a wave it would what seemed to me hit the rev limiter and kill the ski right till it was barely idling. This was happening even at a slow speed in light chop. Then it did the same thing hit a wave and poped the rev limiter but it killed the machine and i had nothing on the switch or anything checked the lanyard and a couple connectors up front and still nothing, got it back to the yard and took the positive terminal off and put it back on and it started right up any suggestions to what my issue is?
 
Ok found out the new mpem I had bought was bad so bought a new one and now the ski ran great but after about 40 min it dtarted to miss on a cylinder then it quit all together went to restart it and there was no power to the switch again pulled the positive lead off the battery to reset the system and hit the button it cranked over twice then nothing again. Any body have any suggestions did i get another bad part or is something grounding out the system and frying the mpem any help is appreciated thanks
 
Sounds to me that you have poor battery power.. As the volts drop the MPEM begins to fail. Jump the solenoid, I am betting it does not crank or cranks poorly at this point. Do a battery load test if you prefer not to jump the solenioid...
 
Check that ground connection on the side of the starter, you will access it from starboard side of engine beneath carbs. At times it can become submerged depending on how much water your ski may have taken on board in past, and water in electrical connections causes corrosion which may or may not be an issue on yours. Its worth checking.

It is the other end of the cable that attaches to your battery negative terminal. I just hit a wake a few days ago and had to get towed in due to neg cable breaking off of starter from corrosion and age.

13mm short socket, on 3-4" 1/4" drive extension and ratchet. May have to play with length of extension and possibly use a wobbly adapter depending on your hull shape. Im used to 96' xp.

Rob
 
Thanks guys you were right the battery was dead charged it up and it ran great:thumbsup:. Now the next question is what would cause it not to charge? The connector from the stator is not the best going to replace the plug but if that does not fix it what else should i look at.
 
Ok so the plug from the stator was lose replaced that and tried it on the lake ran great for like 2-3 hours then pulled up to my uncles boat killed it and sat there talked to him for maybe 15 mins. Went to start it and it would only rollover twice then cut out, wouldn't crank more than twice. Got it home and charged the battery firgured it was the same promblem went to start it in the drive way to check if it was chargeing and still would only crank twice, then it would crank normally but have no spark, then would go back to only cranking twice, then would start to crank normally but only spark on the rear cylinder, then lose the spark again, then go back to only cranking twice.

Does this sound like a promblem with the mpem again or something else? Any help would be appreciated this ski is kicking my a$% right now.
 
A lot of the latest seem to revolve around the battery being recharged and then again. Seems maybe your battery is shot and won't hold a charge. Usually have to replace every three years in my SPX's. Same problem occurs in my ATV's. If you do the load test as previously suggested it should prove it. I buy YT16L Scorpion AGM battery from BatteryStuff.com. @ $75 delivered. Good luck.
 
I had charged the battey over night tried it, it did what I had said previously then when that didin't work the next day i took it to Advancced Auto to have them test it they told me that it was in perfect shape and that the battery had more cranking amps then what the battery was rated for. Maybe i had it overcharged ill take it tomorrow to have it retested after it has sat for awhile unless someone says otherwise.
 
ok had the battery tested again it came back as being really good so that is not my issue still have the cranking issue and do not have any spark still when it does crank. anybody have any advice on this it is really appreciated.
 
If you truly have a good battery, it will crank. Again, if it is good, then you have a poor connection, bad cable, or bad starter.

What happens when you jump the solenoid? When it is running, what is the voltage at the battery at idle? and revved up a bit?
 
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