Battery draining overnight - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 08-14-2012, 05:09 PM Thread Starter
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Battery draining overnight

Got my lighting figured out. New adventure time...the battery seems to be draining overnight. It is a new battery, ~200 miles on it. Nothing is lit/glowing, etc., but after being parked overnight it doesn't want to turn. I am going to return the battery for a new one, as I have my suspicions that it's the culprit, and I cannot seem to find any open circuits that would draw on the battery. Any common/known problems of this sort?
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post #2 of 10 (permalink) Old 08-14-2012, 05:15 PM
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I think you have covered the most probable causes. Get the battery checked/exchange it. It's either being drained, or wont hold a charge.

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post #3 of 10 (permalink) Old 08-14-2012, 06:15 PM
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if it was a dry charge battery where you have to pour the acid in yourself make sure you follow the charging instructions word for word or it will do just as you describe
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post #4 of 10 (permalink) Old 08-15-2012, 02:38 AM
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I know on a car if there is a bad diode in the alternator, it will drain the battery overnight.
A bad rectifier will do the same. After you replace your battery, check the charging system, and see if you are getting good voltage.
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post #5 of 10 (permalink) Old 08-15-2012, 08:05 PM
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Quote:
Originally Posted by TSmith68 View Post
I know on a car if there is a bad diode in the alternator, it will drain the battery overnight.
A bad rectifier will do the same. After you replace your battery, check the charging system, and see if you are getting good voltage.
From what I understand, if you have the ignition turned to "off" there should be zero drain on the battery.....so that would mean you can test the resistance/conductivity? of the battery terminal wires (with the battery disconnected) to see if something is shorting out or using power......

Someone correct this if I am wrong?

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post #6 of 10 (permalink) Old 08-16-2012, 12:55 AM
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Yes, you can check for drainage with the key off.
If I remember, you hook up a voltage tester to the positive side of the battery.
You unhook the positive cable, hook the positive side of the tester to the post on the battery. Hook the negative side up to the cable, and set the meter for amps.
If there is a draw, it will show up on the meter.
A digital meter will work better, as it will show tenths of a volt as opposed to an analog meter with the dial sweep.
If I have that right please let me know. If not please correct it so nobody fries their system.
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post #7 of 10 (permalink) Old 08-16-2012, 02:10 AM
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Quote:
Originally Posted by TSmith68 View Post
Yes, you can check for drainage with the key off.
If I remember, you hook up a voltage tester to the positive side of the battery.
You unhook the positive cable, hook the positive side of the tester to the post on the battery. Hook the negative side up to the cable, and set the meter for amps.
If there is a draw, it will show up on the meter.
A digital meter will work better, as it will show tenths of a volt as opposed to an analog meter with the dial sweep.

If I have that right please let me know. If not please correct it so nobody fries their system.
Current flows Neg. to Pos., ....I would pull Neg. cable, neg. meter lead to bat. pos. lead to cable, Amps setting on meter. But TSmith68's above method will obtain same results. Ant current draw shown on meter (obviously, with every off) would indicate a problem exists.

hope this helps
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post #8 of 10 (permalink) Old 08-16-2012, 04:36 PM
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TSmith68 has the test right to check for battery drain. usually caused by a low resitence short, which you will not find easily with a meter. I was a Navy Electronics Tech and trust me a wiring short is a PITA to find.
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post #9 of 10 (permalink) Old 08-17-2012, 12:34 PM
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On a car you can hook a 12 volt light bulb between a frame ground and the negative batter post. negative cable disconnected. If it glows you have a short to ground. Not sure if it will work on a motorcycle though.
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post #10 of 10 (permalink) Old 09-04-2012, 10:59 AM Thread Starter
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Took the battery back to Advance, and they put the tester on it. I really expected a hard time, but the young man said "Yep, its defective", and gave me a new one. Charged it properly, and all is as it should be, sat for well over a week and barely turned over before firing up. Must have been a bad cell in there somewhere.
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