Battery keeps running down. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 08-18-2014, 08:27 PM Thread Starter
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Question Battery keeps running down.

After a ride of just about any length my battery runs down enough so that it will not crank the engine. I have tried new batteries with same result.
Could this be the stator or a short dragging the battery down?
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post #2 of 8 (permalink) Old 08-18-2014, 09:42 PM
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Check your voltage regulator first.look at the plug and at the pins comming offa the regulator for corrosion .

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post #3 of 8 (permalink) Old 08-18-2014, 11:39 PM
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Quote:
Originally Posted by OleDirtyDoc View Post
Check your voltage regulator first.look at the plug and at the pins comming offa the regulator for corrosion .
X2 on this

You should get her running and check the charge voltage going back to the battery. The bike will run off the battery for awhile but if it is not getting adequate charge, it is as if you do not have a generator (stator). There are several resources here that will give you instructions on how to check your charging system. Search away and post results and these guys will help you out.
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post #4 of 8 (permalink) Old 08-19-2014, 12:49 AM
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Definitely check the connections in all 3 yellow wires coming from the stator. Mine melted a long time ago. I cut out the plugs and soldered the wires together. It never stopped charging though, I caught it just in time. If the wires are ok/repaired, the simplist thing to do is check for voltage between the battery posts at about 3000 rpm. It should be around 14V, and should go up and down with engine speed. If not, the charging system is not working, and you can proceed to test the stator. I found mine was shorted to ground.

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post #5 of 8 (permalink) Old 08-19-2014, 07:06 AM
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First step. Check charging voltage. You may just have a crap battery

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post #6 of 8 (permalink) Old 08-19-2014, 02:52 PM
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Quote:
Originally Posted by Mercury View Post
First step. Check charging voltage. You may just have a crap battery
He has already tried new batteries...

First I will clean all the grounds, make sure that all connectors are plugged in and tight, then check voltage output of the stator
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post #7 of 8 (permalink) Old 08-19-2014, 05:35 PM
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Especially check the ground to the frame and engine. The battery ground cable connects to the left side of the frame, then another ground cable connects to the right side of the frame, and the other end of it connects to the engine. 4 different connections in all.

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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
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #8 of 8 (permalink) Old 08-19-2014, 09:09 PM Thread Starter
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Battery runs down

Thanks everyone. I will try everything you all mentioned and will let you know.
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