Battery charging issue - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 06-20-2019, 03:01 PM Thread Starter
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Battery charging issue

Not sure if I have a charging issue or not. I just took out my '86 for the first time in 3 weeks, it started up with some difficulty, rode it maybe 6 miles, stalled once when riding, but seemed ok. When I went to start it shortly after it was really hard to start, then it died and I couldn't get it started again. Walked it home and battery read about 11.5 volts (this was after trying to start it a bunch of times). My question is, could this be somewhat normal, and I didn't ride it enough to charge it, or could it have a charging issue? Seemed to work ok before I let it sit 3 weeks..
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post #2 of 8 (permalink) Old 06-20-2019, 03:44 PM
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Charging issues are endemic on this machine.

11.5 volts is low, much lower than that indicates a deceased battery. What sort of battery is it? How new is it? What was the voltage while running?

Pretty much everyone on this forum wires in a voltmeter to keep an eye on charging at all times. Buy a decent AGM battery, they are better all round.

These bikes will not start if your battery is low, the ignition system needs a full 12V to operate properly. She will crank OK but splutters and backfires.

Charge the battery up, get her started and check the charging voltage at 3 or 4k RPM, needs to be 14V or better

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post #3 of 8 (permalink) Old 06-20-2019, 04:30 PM
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What Tony said. 3 weeks wouldn't effect an AGM battery, but guessing you don't have one?
Some bikes have clocks which are a parasitic drain, but the Vulcan has nothing that would do that. Make sure you use a MOTORCYCLE battery charger, not a car charger.
Also, as this is your first post, it be nice if you posted an introduction in the Newbie Check-in page.

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post #4 of 8 (permalink) Old 06-21-2019, 02:12 PM
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Yes stranger, it would be nice to give an introduction. Once you get a good AGM battery, check all your battery connections. Also check your regulator/rectifier connections

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post #5 of 8 (permalink) Old 06-21-2019, 02:48 PM Thread Starter
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Thanks for the tips y'all!
I do have a decent, newish AGM (assuming ThrottleX makes decent batteries), checked the connections, they look good. After charging batt is reading 12.7v with bike off, 12.9v at idle, and about 13.9v at 3500rpm.
I do have an idea of what I *hope* was the problem. The bike has some strip LEDs installed from previous owner. There is a toggle switch to turn them on, but you also need to turn them on with a remote. Well I left the toggle "on" thinking that since the lights were not actually on there wouldn't be a draw.. "off is off right??"... but I'm hoping that was what drained it over time.
If I have more issues I think the next thing I'll try is removing those lights!!
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post #6 of 8 (permalink) Old 06-21-2019, 03:01 PM Thread Starter
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Also, I like the idea of an in line voltmeter!
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post #7 of 8 (permalink) Old 06-21-2019, 03:41 PM
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Quote:
Originally Posted by Kyler View Post
I do have an idea of what I *hope* was the problem. The bike has some strip LEDs installed from previous owner. There is a toggle switch to turn them on, but you also need to turn them on with a remote.
That seems like a good guess. Anything that turns on with a remote has "always on" circuitry constantly scanning for incoming signals, and that will be a constant drain. It's usually a very small draw, but you never know!

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post #8 of 8 (permalink) Old 06-21-2019, 08:27 PM
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Your numbers sound good

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