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12 Volt Low

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beachybeach24

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Hey guys quick question. I was out on my ski the other day (2000 gtx millenium) and I was riding for about a half hour and all of a sudden my 12 volt low light started blinking. I rode the ski back to the dock and pulled the battery and the guage said the battey was reading 11.9 volts. Fully charged it says 12.7. Could this be the rectifier? If so, how hard is it to replace? Thanks all for your help
 
Older seadoos usually say "12v low" when you press the start button, and some don't go away until like 20-30 minutes later.
 
I was on vacation the week before and rode everywhere with no problems. This just happend out of nowhere. Then when I shut it down and restart it the message is gone until about a minute then I get the constant 12v low and red blinling blinking light.
 
beachybeach24 said:
I was on vacation the week before and rode everywhere with no problems. This just happend out of nowhere. Then when I shut it down and restart it the message is gone until about a minute then I get the constant 12v low and red blinling blinking light.
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Sounds like the battery you've got has an amp issue, before diagnosing try a different battery.
 
I just bought that battery at an auto parts store. Its a sealed battery. I still have the paperwork for it. Maybe i should take it to the store and have them test it. Its only got like 13 hours on it
 
There were a series of years where the 12-volt low stayed on and the software was updated to lower the where the light would turn on. Most that have this issue, pretty much let it go as the ski runs fine and the light turns off once you run the ski.
 
The battery, after being properly recharged and allowed to set static for overnight, should settle at rest to no less than. 12.5 volts measured using a DVM. Otherwise, the battery has something wrong with it.

Always suspect the battery first, even and especially if it's new. Some folks insist on a new battery every year and generally that works well but it's amazing how many new batteries don't make it past the first few months. I think it's b/c those things get tossed around abused and IMO the construction methods are substandard for most wet cell batteries.
 
beachybeach24 said:
Didnt put it on a voltage meter while running. Just had a 11.9 reading when i originally put the battery on the charger
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Get the running numbers and we will go from there. And by the way, 11.9 is not a good sign for a battery. In most cases they are 12.4 iand higher when doing nothing.
 
beachybeach24 said:
Thats why im thinking about just taking the battery back to the store. A 130 dollar battery should last more than 5 weeks.
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I agree, but suggest you see where the volts are running before you return it. No sense in getting a replacement if you have a stator or rectifier issue..
 
beachybeach24 said:
Ok, I hooked it back up. Ill start it on the hose and rev it up real quick when i get home to see what it reads
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You don't need the hose. You can run if for 30-45 seconds and not need water. Even on the hose, the max recommended time is 1 minute.
 
Ok ill start it and see what it reads and ill give it some throttle. Hope its not a huge deal. Ski has been running great with the exception of my fuel guage not working.
 
So i hooked it up to my charger that has a digital voltage reader. Without charging the battery was holding steady at 12.4 volts. It has a "alternator check" on the charger and it came up fault.
 
Motor sounded like it was "jumping" around a bit but i think thats because it was out of water. Before i started it battery at rest was 12.6. While cranking went to 11.9 once it fired up went up to 12.4 and held the same position even with throttle.
 
beachybeach24 said:
Motor sounded like it was "jumping" around a bit but i think thats because it was out of water. Before i started it battery at rest was 12.6. While cranking went to 11.9 once it fired up went up to 12.4 and held the same position even with throttle.
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You are not charging and that is likely why you have a battery issue...

If you were charging you would have been above 13 volts and gone higher when you revved the engine.
I can be a few things, but the easiest and cheapest is the Rectifier. Either buy a known good one from [MENTION=41828]Minnetonka4me[/MENTION] and or an OEM. Many of the cheap aftermarkets are cheap and simply don't last.

Minnetonka can likely tell you how to do a static test as well.
 
I just saw someone say that the 951 the rectifier is built into the mpem? Am i really going to have to replace the whole computer??
 
beachybeach24 said:
I just saw someone say that the 951 the rectifier is built into the mpem? Am i really going to have to replace the whole computer??
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Some are and some are not, I don't know them well enough to know which just yet. BUT,,, even if it is, I am pretty sure you can replace it with an external unit.
[MENTION=31048]LouDoo[/MENTION] [MENTION=57920]racerxxx[/MENTION] and or [MENTION=41828]Minnetonka4me[/MENTION] can help us on that one...
 
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What year and model ski do you have? Every 951 ski I have see has had an external mounted voltage reg./rectifier. They're super heavy duty almost like a 4-tec, I've personally never heard of one going bad, but that doesn't mean they don't. Either check your service manual or parts diagram for your ski.

Lou
 
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