96 xp rectifier problems

[Chr1sfrench]

I have a 96 seadoo xp 787. Was running great then started having problems that I diagnosed as a bad rectifier. I did this by unplugging the red wire and the machine ran great. So I got another oem rectifier and installed it and it fell on its face just like it did with the original rectifier. I unplugged the second rectifiers red wire and the machine ran great. So now I'm thinking stator. So now I pulled the stator and swapped with another oem stator. STILL FELL ON ITS FACE. Now with a new stator i also installed a 3rd different rectifier and it's STILL falling on its face. HELP?!

 

[Matt Braley]

I have not had a bad one of these yet....... http://www.ebay.com/itm/Sea-Doo-Reg...ash=item2f051eb551:g:kjAAAOSwB09YDmm2&vxp=mtr

 

[emspjay]

1+ that's what I put in my 96 GTX last year still works great.

 

[Chr1sfrench]

So you guys think it's still rectifier? It's the only thing that makes sense but what's he likelyness that all 3 are bad? Lol. I checked for a short or loose wire. Everything is in good shape

 

[dieselndoo]

Clip plug wires, clean grounds at coil.... Does seem weird

 

[Chr1sfrench]

I've clipped the plug wires already. The grounds are clean. The damn thing only runs good with the red wire on the rectifier unplugged

 

[Matt Braley]

I've clipped the plug wires already. The grounds are clean. The damn thing only runs good with the red wire on the rectifier unplugged

Tell me how it runs when you plug in the part I've recommended. I don't trust OEM rectifiers(they've earned that).

 

[Chr1sfrench]

I just ordered it before you commented. Lol. We will see

 

[Chr1sfrench]

To me, these all look bad with he brown spots

 

[Mekanix]

Those all look good. Those brown spots are the epoxy covering the microprocessor.

Need more information. Your getting the symptom of overvoltage or A/C voltage being fed to the mpem.

When the Regulating side of the unit fail's you will get over 15V DC going to the mpem and CDI section which it hates and at a certain RPM it just gives up.
When the Rectifier part fail's you will sometimes get pulsed DC which the mpem also does not like. This is the A/C voltage part that has similar effects.

So what I'd like to know is:

Connect a meter to measure voltage at the red wire connection.

1. While running with everything hooked up properly, What do you get for DC voltage when it falls on its face.
2. Same thing, but look for A/C voltage.

Should be no A/C or just some weird low voltage stuff that is insignificant.
Should be almost 14.4V DC MAX right at the connection between the red wire and wiring harness.




Fun fact: If you use B8ES plugs, As in missing the "R" for resistor, the mpem will behave the same way because the plug wires create a tone of RF interference which interferes with the signal's its getting.

 

[Chr1sfrench]

So I installed the new rectifier recommended to me off eBay. It does the same thing. No change. So now I've gone through 2 stators and 5 rectifiers with no change.

 

[Chr1sfrench]

Mekanix. I can't do any of your tests bc it only acts up on the water. Runs great on the trailer.

 

[Mekanix]

I'm sure you can rig something up so that you can see the voltage while your running it.

Another option is to leave it tied to the trailer and do it at the ramp. Just make sure there isn't anything that will get sucked up underneath while your testing.


Another thing to consider is the stator's ground to the engine casing, and the ground between the coil and the engine. Either of those being weak might brake down under load when the charging system is working well.


A quick way to check that is to run a ground wire from the battery negative to the engine casing and to the ground plate that the regulator is mounted onto where all the grounds are ganged up.