Anyway to test mpem?

[jcleary93]

Is there anyway I can test my 657 mpem while the motor is out. I just opened up the box and rusty water poured out.. Is it definitely toasted? Anyway to check before I buy a new one?

 

[Coastiejoe]

There is and it is pretty straight forward. I believe you remove it and hook it direct to the battery. If the fuse does not blow,, it is presumed good.

However,, let [MENTION=41828]Minnetonka4me[/MENTION] confirm this for me..

 

[Ankeneyou]

http://www.seadoosource.com/mpemtest.html

 

[Sportster-2001-951C-Stock]

I would want to simulate as much as possible the engine sensors using alternative or original type components as necessary to confirm as much as possible, especially ignition spark.

I would be amazed if everything inside that flooded box wasn't in need some level of assistance, especially the electrical components.

If you're going to keep and ride the ski for another 15 years a replacement spare box might be money well spent assuming budget allows. Keep in mind, budgets can get blown apart unexpectedly.

Personally I really appreciate these old skis for what they represent in terms of bang for the buck vs durability, I don't need to fly 70mph, 30~35mph is my comfy speed with ability to ski on a whim. Fired mine off for a ride last Sunday and thought it seemed to run better than I remembered from last year....

 

[Minnetonka4me]

Just buy a complete ebox and get it over with. That isnt worth using for anything. I should have one in stock.

 

[jcleary93]

I might try and see if I can get some use out of it but how much for a used box? [MENTION=41828]Minnetonka4me[/MENTION]

 

[ski-d00]

MPEMs are actually quite reliable after they get wet. I've cleaned up quite a few rusty e-boxes and they almost are always fine.

Clean up the connections and test it using the specs test. Also, I've had a couple MPEMs fail those resistance checks on older skis and still make the ski run fine oddly enough. It's worth a try, nothing to lose really.

 

[jcleary93]

Hmm. I haven't had a chance to test it yet but I'm hoping I don't need to replace it... Only the bottom half of the box was filled with water. All of the fuses are still good and stayed water tight. You can see in my picture ( top right ) that black wire actually rusted off of the solenoid. Can I solder that back on? Or anywhere else I can connect it. [MENTION=16262]ski-d00[/MENTION]

 

[ski-d00]

You'll need that wire on the solenoid. I would just get a new solenoid since they are only like $10. SeaDoo even made a kit to upgrade the old post type solenoids to the newer plug in type which I think is like $35 but includes the newer all black sealed solenoid.

 

[jcleary93]

Ok great thanks. also after looking at the wire test posted above I'm a bit confused by what it means by male/female/ring terminals. Where on the wires do I test them do I unscrew the water resistant caps then the wires are exposed there?

 

[ski-d00]

unplug/disconnect all wires on the MPEM, male terminals will have a post type tip, female will have a hole to accept the post, ring terminals are rings that go over threaded studs that get tightened down by nuts.

the test is done with the MPEM completely removed.

 

[jcleary93]

So I just need
To remove the mpem from the ebox? Not the whole ebox ? Thanks for all the help

 

[ski-d00]

You don't have to actually remove it but every connection needs to be disconnected. The battery should be disconnected before you do any of this. If it were me, I'd remove the MPEM and all the components to clean the box properly and get a new solenoid.

 

[jcleary93]

Ok thanks. I'll get a good look at it this weekend

 

[jcleary93]

I put a new starter solenoid in yesterday then put the motor back in and nothing happens when i try to start it. I think I either didnt connect all the wires correctly to the solenoid or perhaps I dont have the motor grounded correctly.. I put the ground wire under the motor mount then right to the battery. I cant remember how it was set up when i pulled it apart. anyone have a wiring diagram for the solenoid or know where the ground wire is supposed to go?

Also still nothing happens when jumping solenoid

 

[ski-d00]

main ground wire should go directly to the starter, either the mount bolt or will have a separate ear to bolt to. the ground wire is easier to bolt on with the engine out.

the wiring is pretty simple, manuals can be downloaded for free, do a search.

if it doesn't do anything when jumping the solenoid, you either have it wired wrong, a bad connection or bad wire, or a bad starter.