2001 Waverunner constant battery drain - Page 2 - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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post #11 of 16 (permalink) Old 07-21-2019, 12:40 PM
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Check the stator, shorted stator will drain the battery overnight, seen it several times, seems to be pretty common.
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post #12 of 16 (permalink) Old 07-21-2019, 08:18 PM Thread Starter
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Thanks, I will. I also want to check the rectifier/regulator if that has shorted it can cause a drain too.
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post #13 of 16 (permalink) Old 07-24-2019, 05:28 PM Thread Starter
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Okay, the Rectifier/regulator has been replaced. Now the current drain is down to 3.6 ma and that is coming from the meter panel. It acts like a capacitor that is leaky. Plug in the panel and the draw is about 15 ma but it drops to a steady 3.6 ma over a period of 7-8 seconds. Been watching for two hours now and it is still at 3.6 ma. The battery has a capacity of 19 AH and I would guess it can still start with about 75% capacity. This is the calculation I was given for how long that battery can tolerate a 3.6 ma drain and still have 75% of capacity.

19AH = 19000mAH
75% = 19000mAH * 0.75 = 14250mAH
25% = 19000mAH * 0.25 = 4750mAH
4750mAH / 3.6mAH = 1319H
1319H / 24H = 55 days

So it would seem that as long as I use it at least once per month for a few hours, it should be okay.

Just for completeness, is this a normal amount of drain for a jet ski that is off or is it typically zero drain?

Last edited by PickyBiker; 07-24-2019 at 05:32 PM.
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post #14 of 16 (permalink) Old 07-24-2019, 08:31 PM
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Anything with a computer, which the dash panel is, will have some drain. 3.6 MA is well within acceptable current drain.
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post #15 of 16 (permalink) Old 09-05-2019, 03:40 PM
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Hello, i am new to this forum, so not sure how to ask a question or start a thread but it is related to Yamaha 2001 XL800 battery issues also. I get a battery alarm beeping and flashing in the gauges, if i charge the battery then it will go sometime ok but then the alarm comes in. The battery has 12v with ski off and also just 12v with ski running.
is it the rectifier/regulator, how do i check before i spend the money and buy it. The fact that the voltage is not increasing when the ski is running tells me that the battery is not charging, am i correct? any ideas are welcome.
I hope i am imposing by adding to this thread, thanks
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post #16 of 16 (permalink) Old 09-06-2019, 12:15 PM
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Unplug the stator from the rectifier, with the ski running and a meter set to AC, test the output of the stator. You should see output on all 3 wires. If not you have a shorted stator, or a broken winding. If you do see output on all 3 plug it back into the rectifier and test the electrical system with the machine reved up a bit, as they don't usually charge at an idle. If you don't see 13.5-14 volts dc, you probably have a dead rectifier. There is no way to test the rectifier so you have to test the rest of the system to eliminate other possibilities.
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