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checked rectifier weird readings.

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brandon32689

brandon32689

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So I hooked the volt meter up to the battery and it read 12.3 I started the ski and reved it to like 5000rpms it reads high 12s almost 13 and then checked the other ski as soon as it starts it goes to 1 so does that mean it needs a new recitfier?
 
I have a recitfier I bought a while back so I put it in the ski that makes the volt meter go to 1 and it still does the same thing. The ski runs great but what could this be. The other ski actually won't go to 13v no matter how much I rev it to, stays around 12.3 or so... Could that explain the every now n then surging on this ski?
 
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I think it would be like a car or motorcycle. Start it up and disconnect the battery. Did the seal on the stater cover leak?
 
maybe the speed limiter i had a similar issue and changed my speed limiter and problem solved. you ever hook up your ski to a car maybe to test it when you bought it or anything? cause i think that's what screwed mine up the car was running and i think the power from the alternator might have burned out the speed limiter.
 
TFWildman112 said:
maybe the speed limiter i had a similar issue and changed my speed limiter and problem solved. you ever hook up your ski to a car maybe to test it when you bought it or anything? cause i think that's what screwed mine up the car was running and i think the power from the alternator might have burned out the speed limiter.
Click to expand...

the newer skis don't have an speed limiter. Also, disconecting the battery on most jetskis will cause the engine to turn off. The mag doesn't put out enough power at low RPM's to keep the system running.


OK, this is on an 800 engine?

Disconnect the yellow wires, and make sure all 3 phases of the stator or OK. (they should be close to the same readings on an ohm meter) If they are... then I would think the rectifier is bad. (even if it's new) Also... if you were getting 130v in the charging system... you would have cooked your MPEM by now. Make sure the meter is working right.

Finally... if the voltage is getting higher than 0.5v over the battery resting voltage, while the engine is running... then you are charging. If the battery is old, it may be putting an extra load on the charging system, and you are not getting the full voltage at the battery.
 
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Yes it is the 800 engine. I know there is nothing wrong with the meter it works just fine on other ski and shows 12.3 on battery before I start it. What's weird is this ski has never gave me trouble and we've been out maybe 10 times.

I know that's not really sending that much or the battery would prob blow. But something electrical is causing all this. I checked it again and the gauge went past 200 and said 1 so I switched to 2000 and it said like 1445.4 volts. So something is wrong ya know. As soon as I turn ski off it goes back to 12.3-12.5 .

I've swayed recitfier back and forth so far and they seem to be working in other machine so I made sure a good working one is in there so now I'm back on the search.

So are you saying pull the plug that goes to stator and do a ohm reading on the plug?

I thought about switching complete computer boxes and seeing if prob moves to other ski I just don't want to chance messing anything up.
 
The charging system in these skis is very basic.

a) 3 phase alternator.
b) a regulator/rectifier.

If you aren't charging... it's one of those 2 things.

Yes... in an 800 mag, you have 3 yellow wires (alternator legs) black (Ground) and then the black/yellow and Yellow/white for the pulse coil.

If you check across any of the yellow wires, they should all give you the same readings. (and nothing to ground)


BUT... the thing that is confusing me is that the voltage reading on your meter becomes a function of the setting. If the voltage is higher than the setting... the meter should give you a 1.xxx. (like an open) AND... if you got to 1400v... everything would be roasted.

I'm thinking that the regulator is letting AC voltage threw, and it's doing crazy things.
 
ya that is what is confusing me to if i keep it on 20v on the meter it does just go to 1 and if i switch it to 200 it will go up and eventually just go to one if i switch it to 2000 same thing, I know that there is no way i am getting tha tmuch volts so it has to be something else is there a way i can check the stator? I mean it has to be doing something right because it has been keeping the battery charged this entire time. I have switched the recitifer a couple times from ski to ski and i have a extra one, i notice that the other ski is still funtining right and this one does this so would that mean it is the stator?

or could it be in my mpem or something? man this is confusing expescially since the ski runs so great but i am scared to take it out now in case of messing something up ya know?
 
When measuring at the battery meter should be set to DC in the 20 range. When measuring at the yellow wires (stator) meter should be set to AC in the 200 range. In order for the battery to charge, the system must be supported by an alternate power source (stator & regulator) so the engine must run without a battery.
 
I know Im doing measure right I just moved it from 20 cause it was going higher. I don't think.seadoos will run if u remove battery its not like a car. Also I'm pretty.sure to check the yellow wires I need to be on ohms not ac
 
At this point I would assume one of the following 1:your meter is not functioning correctly 2: It's not set correctly 3: your not sure what the readings mean. When measuring DC at the battery with engine running voltage should not go above 15VDC. When I measure at the battery on any one of my 5 Sea-doo's (93xp, 94xp and three 95gtx) I get 13.76VDC to 14.25VDC. If battery is fully charged and engine not running I get 12.4VDC to 12.6VDC. When I measure the yellow wires engine off, battery disconnected, meter on ohms @ 2000 I get 1500MOhm's which is what you want. Below about 1000MOhm's means your windings are shorted and no reading at all means windings are open. If I want to measure the AC output at the yellow wires I set my meter to AC @ 200 and I get 130VAC to 150VAC. As an Engineer Technician for GE I see Engineers make the mistake of not putting the meter leads in the wrong holes all the time. Not that this is your case because it sounds like your set up right. So in conclusion of all this is if stator Ohm's & VAC output is good then regulator could be bad. Transistors in the regulator can cause strange readings when they fail. They can open (causing lower to no output), short (causing higher to no output), Leaking (causing all kinds of erratic behavior). Oh, and when I disconnect the battery my skies still run but that doesn't mean that your skies don't have a internal safety switch for when the battery is disconnected (unlikly).
 
Okay man, well I'm positive I have the volt meter right and I know how to read a volt meter and I've had my grandpa helping me to a little w the electrical problem. Hes a electricion n I'm using his fluke meter so im pretty sure the problem. Is in like the stator you are saying. I have swayed the regulator between the skis and even got a extra one they all seem to work in the other ski. So what yellow wires are you talking about that I should check? The ones off the cord that plugs into the mag? Or how do I check the stator ?
 
Yes the ones off the cord that plugs into the mag. I realize you don't have a Sea-doo ignition tester but there other ways you can check things. If you leave the charging coil wires hooked up and measure between yellow and ground you should see an AC output while engine is running.
 
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Will do man Im on phone right now but I've been messing with them this morning and I swayed the entire computer box and the problem.was still there and the other ski was doing fine still so I guess I can eliminate computer and recitfier. So what's left.
 
okay i have even swaped battery just to make sure that a dumb little thing like that would not cause it, hmm well since it is still charging the battery should i wory about it or what? i bet its a big pain to change the stator out since i would have to remove the flywheel cover and its hooked to a motor mount
 
I would say it's possible to remove the flywheel cover with the engine in and yes a big pain. I tried to take my stator housing cover off and the bolts broke. Since it is still charging the battery is the part that's got me stomped. According to the manual it should be 14.5VDC-14.8VDC at 5500RPM. I didn't rev mine up and got 13.76VDC to 14.25VDC @ idle. Maybe the stator is partially working but I thought the rectifier had to have all three AC input signals to work. I could wrong. I've never had problems with my electrical other than a starter go out but in all my years working on motorcycles and aircraft engines on air boats I never saw a rectifier go bad. It was always the stator.
 
ya its weird to me but it has to be working some how i am wondering if it will hurt anything if i just leave it how it is for now and not worry about it
 
So I know this thread is older but I have had a similar problem. I have a 96 Gsx that had the exact same problem. Battery not charging, 12 volt low etc. Put my meter on it and 12.x when off and something stupid like 190 volts when running. Unfortunately I ran it for a while without knowing. Then all of a sudden, ski would start run great then when u shut it off it would need 20 mins to start again. Replaced rectifier same problem, ended up today putting a new electrical box in the front with CDI, MPEM etc and now voltage at idle or when running is 12.8. And now problems with restarting the ski. So still now charging but at least now throwing 200 volts at MPEM. Gonna try the new rectifier again then test strator. Not sure if this helps but at least the concerns over the use of the meter is fixed. It does happen.
 
douggie said:
So I know this thread is older but I have had a similar problem. I have a 96 Gsx that had the exact same problem. Battery not charging, 12 volt low etc. Put my meter on it and 12.x when off and something stupid like 190 volts when running. Unfortunately I ran it for a while without knowing. Then all of a sudden, ski would start run great then when u shut it off it would need 20 mins to start again. Replaced rectifier same problem, ended up today putting a new electrical box in the front with CDI, MPEM etc and now voltage at idle or when running is 12.8. And now problems with restarting the ski. So still now charging but at least now throwing 200 volts at MPEM. Gonna try the new rectifier again then test strator. Not sure if this helps but at least the concerns over the use of the meter is fixed. It does happen.
Click to expand...

ya man i ended up shreding that ski up into tiny pieces and putting it into the dumpster i had a new problem with it every time it was a lemon just parted it out i think my problem was the rear ebox that was the only thing i did not swap out in the end so i didnt even keep it lol. but i have 2 spare stators if you need to by one
 
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