2001 Waverunner constant battery drain - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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post #1 of 14 (permalink) Old 07-18-2019, 08:24 AM Thread Starter
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2001 Waverunner constant battery drain

I have a 2001 Yamaha Wave Runner that has a battery drain problem even when the jet ski is off. If the battery is charged fully and left to sit for a day, the battery doesn't have enough left to start the jet ski the next day. It has a brand new battery that was installed to try to fix this problem but it didn't help. Something is draining the battery when it is off and the key is removed.

Ideas on what to check?
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post #2 of 14 (permalink) Old 07-18-2019, 09:48 AM
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Hi PickyBiker,
Did you get my message on the return mod jet size? I discovered that I had a typo in my notes. You need an 87/87.5. not an 82 as I told you. Pm me your address and I'll send an 87.5 I have.

What I would do for electrical draw is. disconnect your ground cable at the battery and either using a test light or multi meter on amps. Now jump either between the cable and battery -. If there is a draw the light will light or meter will show it. Now disconnect one item at a time. Start with the stuff up front that in plugs. Start/stop switch, power valve Servo motor, ECT..... Then move to the electrical box and do the same.

As you unplug and plug back in watch the light or meter. If the draw goes away you've found your cause. Then you can test that item.
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post #3 of 14 (permalink) Old 07-18-2019, 10:25 AM Thread Starter
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Yes, I got your info on the 87/87.5 jet size and I pm'ed you my shipping address. Doesn't matter now because I have reinstalled the carburetors and put everything back together without the mod you described. Tt runs pretty darned well now at 47MPH with a 215lb rider.

This battery drain issue is next on the list. This post was mainly to see if this was a common issue and if there was a readily available fix. If I don't get something in the next day or so, I will do as you suggest with an amp meter.

You have been terrific on helping with the carb issue and I do appreciate your willingness to help ghere as well.

Best regards
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post #4 of 14 (permalink) Old 07-18-2019, 11:38 AM
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Pm received and sent
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post #5 of 14 (permalink) Old 07-19-2019, 11:32 AM Thread Starter
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Does anyone have a wiring diagram for the 2001 Waverunner XL800?
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post #6 of 14 (permalink) Old 07-19-2019, 07:00 PM
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The diagram is in the back of the manual. There are some available as downloadable or you can order a hard copy. Unfortunately I don't have an XL/xlt diagram.
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post #7 of 14 (permalink) Old 07-20-2019, 08:44 PM Thread Starter
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The services manuals are very expensive, but I found a used set of the Service manual and Guide Book for $27 on Ebay.
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post #8 of 14 (permalink) Old 07-21-2019, 08:01 AM
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I think this is for 2001 xlt800 if that helps.
https://www.manualslib.com/manual/10...er-Xlt800.html
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post #9 of 14 (permalink) Old 07-21-2019, 09:13 AM Thread Starter
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Yes it does help, thank you!
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post #10 of 14 (permalink) Old 07-21-2019, 11:38 AM
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Check the stator, I've seen it several times. Shorted stator will drain a battery overnight.
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