So... what the hell? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 40 (permalink) Old 07-05-2014, 09:15 AM Thread Starter
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Angry So... what the hell?

It's no secret that I'm not some big time mechanic.... but I can figure out the simpler things most of the time. If it is straightforward I can usually fumble my way through it. Having said that.... Houston we have a problem.

So I replaced the regular battery in my 750 with a brand new AGM battery like a month ago, right after I got the bike. A couple days ago she left me stranded and would not start. It turned over once or twice but then just clicking. I decided the battery was dead and had to call someone to come jump me. I got her back home after the jump but when I stopped to back into my spot to park her she just died.

Yesterday I had enough scratch to get a battery charger and I charged the battery up. The battery seems to have charged ok and it now sitting here with a full charge on it ready to go back in the bike.

Obviously I am VERY hesitant about riding her anywhere since she stranded be but I would love to figure out why the battery seems to have lost its charge or why it didn't keep its charge.

The only thing I have changed since then is to add the Kaw saddlebag/signal relocation kit to the bike. The extenders I added are both hooked up the same and they are insulated so that a ground out would not be possible.

Where do I start?
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post #2 of 40 (permalink) Old 07-05-2014, 09:57 AM
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Where do I start?
If the bike was doing good and all I did was change the battery, rewire some lights, I would check for parasitic drain first. Then check the charging system.
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post #3 of 40 (permalink) Old 07-05-2014, 10:10 AM
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Wire in an amp meter in right away. This will tell you if your dropping battery power.

such as : http://www.jcwhitney.com/kuryakyn-un...rid=c27290u0j1

Or many others, Just make sure it's water proof.

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post #4 of 40 (permalink) Old 07-05-2014, 10:19 AM
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X3 on the batt drain, this is the meter I use, hooks right to the battery and you can use it to charge your battery as well, plus its like 12 bucks

http://www.geniuschargers.com/shop/GC015
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post #5 of 40 (permalink) Old 07-05-2014, 10:21 AM Thread Starter
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If the bike was doing good and all I did was change the battery, rewire some lights, I would check for parasitic drain first. Then check the charging system.
To be honest with you, I don't know if the bike was going good. I just purchased it from a sketchy looking guy. Sorry for my ignorance but what is a parasitic drain?
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post #6 of 40 (permalink) Old 07-05-2014, 10:23 AM
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what is a parasitic drain?
Battery draining itself with the key off. While parked, etc, all the time.

edit-the only reason I would check this first, it is easy to do with test light or VOM. Probably going to be the charging system, dunno.

Last edited by wmsonta; 07-05-2014 at 10:25 AM.
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post #7 of 40 (permalink) Old 07-05-2014, 10:23 AM Thread Starter
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Quote:
Originally Posted by Birdhunter02 View Post
Wire in an amp meter in right away. This will tell you if your dropping battery power.

such as : http://www.jcwhitney.com/kuryakyn-un...rid=c27290u0j1

Or many others, Just make sure it's water proof.
I'll have to see if I can hunt one down cheap. Money is pretty tight right now! I do have a multimeter, couldn't I just check to see if the bike is making 12v?
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post #8 of 40 (permalink) Old 07-05-2014, 10:32 AM
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I'll have to see if I can hunt one down cheap. Money is pretty tight right now! I do have a multimeter, couldn't I just check to see if the bike is making 12v?
Absolutely. Now we are getting somewhere.

Charge the bat and install it. Test for voltage, key off. Should be 12.6v or higher, fully charged. At idle, should be about the same or a little higher. At 4k rpm's it should read 14-15v.

cool.
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post #9 of 40 (permalink) Old 07-05-2014, 11:14 AM Thread Starter
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Originally Posted by wmsonta View Post
Battery draining itself with the key off. While parked, etc, all the time.

edit-the only reason I would check this first, it is easy to do with test light or VOM. Probably going to be the charging system, dunno.
Oh that makes sense, like a parasite!
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post #10 of 40 (permalink) Old 07-05-2014, 11:15 AM Thread Starter
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Quote:
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Absolutely. Now we are getting somewhere.

Charge the bat and install it. Test for voltage, key off. Should be 12.6v or higher, fully charged. At idle, should be about the same or a little higher. At 4k rpm's it should read 14-15v.

cool.
I'll go check this out and let you know what I find. When you say test for voltage, can I just do that on the battery posts?
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