Battery draining. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 10-27-2019, 01:12 PM Thread Starter
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Battery draining.

Ive gone threw three batterys in 6 minths.my first two were cheap walmart batterys.and now i just put one in from autozone.but befor all this i had a walmart battery and didnt have any problems.now i have a radio with amp installed and it has its own on n off button.it was direct to the battery.ive replaced the stator.r/r.ive had to move the blue wire for the head light.im at a lost right now.can someone please help me.this in my daily driver and cant afford to brake down
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post #2 of 8 (permalink) Old 10-27-2019, 03:34 PM
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I’ve learned these bikes like AGM batteries the best. Judging by your post I think of a few possible scenarios. You say you’ve replaced the stator and the R/R, what’s the output numbers? You installed a radio/amp, what’s the wattage draw from those? I’ve read on here this bike has about 70w to spare if the system is left stock. If that’s all good and in check then it sounds like possible wiring.
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post #3 of 8 (permalink) Old 10-27-2019, 04:38 PM
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And that 70w is at peak charging...cruising 55-and up. Stuck in stop and go traffic or idling at a stop light your pushing it at 40w.

If you have a new AGM battery (No Wet Cells!) I’d disconnect that amp for a week and see if you still have an issue.

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post #4 of 8 (permalink) Old 10-28-2019, 07:48 AM Thread Starter
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I just looked up the radio spec and the peak power is 100w.so assuming this is more then likely my problem.
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post #5 of 8 (permalink) Old 10-28-2019, 09:05 AM
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Quote:
Originally Posted by Alexgmb24 View Post
I just looked up the radio spec and the peak power is 100w.so assuming this is more then likely my problem.
Yep. Want a radio? Get a Goldwing

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post #6 of 8 (permalink) Old 10-28-2019, 10:29 AM
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You can change every single bulb to LED and maybe you can fall into spec... maybe, but probably still pushing it. Point is some of that “extra juice” put out from the charging system needs to get back into the battery.
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post #7 of 8 (permalink) Old 11-05-2019, 05:29 PM Thread Starter
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So now that ive replaced the battery, its still not charging.im at a loss right now.replaced everything.only thing left is computer.or another stator.everything wprks fine when riding.sometimes when bike is hot its hard to start again and thats when the battery dies after 4-5times trying to start.but at idel its about 12 v.
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post #8 of 8 (permalink) Old 11-05-2019, 05:57 PM
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Computer?? I’m not sure what you mean there. You have to see what the output is while the bike is running. At idle the battery should be at least 12.5, when you rev the engine and hold it up around 3K or more the voltage should jump up to maybe 13.x or more maybe 14. If it does the stator and R/R are probably in good shape.
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