Battery dies out within 10 minutes - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 05-13-2010, 06:49 PM Thread Starter
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Battery dies out within 10 minutes

If anyone could help? I have an 86 Vulcan 750 with 29,000 miles on it, I'm not too mechanically inclined so you're talking with a rookie here. But after I seen what they were going to charge just to check it I said let me get some help and go for it myself. I bought her the end of last year and really haven't done much to her except the basics for a tune-up.

The problem is I start the bike and watch the voltage on the battery and she starts out with 12.7. When I start her within 10 minutes of idling she drops to 10.9 and dies out. I'll try to restart it and nothing she just clicks at me, so then I have to recharge the battery. I just replaced the battery with a Yuasa 14AHL-BS AGM battery in January, I already purchased a Clymer's manual, still trying to figure that out.

Any ideas what it could be? Any help would be greatly appreciated.
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post #2 of 5 (permalink) Old 05-13-2010, 06:52 PM
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You have a charging system problem. Either a stator, rectifier/regulator, or both. Read up in the Vulcan Versus about how to troubleshoot this. (

Let us know what you find out or what questions you have.


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post #3 of 5 (permalink) Old 05-13-2010, 06:54 PM
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X2 what 93VN750 posted.

2005 Vulcan 750
Black and Silver
OEM Hghwy Bars
O-ring Footpegs
OEM Luggage Rack
V&H Exhaust System
TOC ACCT Rebuild
Die Hard Gold AGM MFB
Spline Lube every tire change
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post #4 of 5 (permalink) Old 05-13-2010, 08:03 PM
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Yep, agreed about the charging system problem, but 10 minutes? I'd say you also have a bad battery as well. There is quite a bit of information on here about how to check the charging system, but I don't remember it, because I've never needed to check mine. I hope it is not the stator, because that means pulling the engine. Jerry.

I am a motorcyclist, NOT a biker.

1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
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1994 Yamaha XT225 parts bike

Last edited by VN750Rider/Jerry; 05-13-2010 at 08:05 PM.
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post #5 of 5 (permalink) Old 05-13-2010, 11:13 PM
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You should have a battery terminal voltage of ~14.5 vdc at 4 to 5,000 rpm. Check it and see what you get, then get back to us. Could be reg/rectifier or stator if voltage is lower than specified.


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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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