blah. another charging thread. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 04-02-2009, 09:40 PM Thread Starter
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blah. another charging thread.

hey everyone.

it's been a while. finally getting a chance to get justice back on the road. here's a weird charging thing... i haven't taken all the readings yet, but i have a voltmeter permanently wired up near the headlight. getting these readings:

idle (1500 rpm): 13.8v

as i rev the engine, volts go _down_.

4000-5000 rpm: 13.1v.

any ideas off the top of your head? just need to deal with this and then take care of a clutch issue and i'm back on the road.

thanks!

paul
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post #2 of 8 (permalink) Old 04-02-2009, 11:51 PM
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Have you checked all the connectors and grounds to make sure everything is clean and tight. Sorry but I don`t know anything specificly that would cause this.

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post #3 of 8 (permalink) Old 04-03-2009, 01:08 AM
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Mine changes like that some times. As long as I am getting a good charge I don't worry about the veriance in volts.

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post #4 of 8 (permalink) Old 04-03-2009, 12:40 PM
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Does the headlight brightness increase with the RPM increase? If so, then the change in resistance across the circuit (i.e., bright bulb=low filament resistance) will cause this. Especially if the volt meter is electro-mechanical (i.e., it need current to move the needle). This happened to mine (electro-mechanical type) when I hooked it up initially in the same circuit as the gauge bulb. I moved the gauge bulb power lead to the license plate circuit and problem solved. However, the gauge is wired to my heated grip circuit (to take advantage of the relay), so I still get a voltage drop (actually if fluctuates due to the heat troller) when the grips heaters are on. I just turn off the heaters if I need an accurate reading.

As a test you might try running the gauge power lead to the battery directly. If that works, then add a relay or move the power lead to another circuit (i.e., one that is not on all the time).


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post #5 of 8 (permalink) Old 04-03-2009, 09:14 PM Thread Starter
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thank you for the responses.

the voltmeter i have rigged up is a digital meter and the headlight brightness doesn't fluctuate with the engine speed. i was digging around for another multimeter to measure the voltage at the battery and came across an old r/r that i thought was bad at one point. hooked it up and now the volts both at the meter wired near the headlight and at the multimeter right on the battery start at 12.5v or so during idle and then go up to 14v at about 5000rpm. soo....

apparently it was the r/r. apparently a screwed up r/r can cause the inverse volt behavior. there you have it. i hesitate to say 'problem solved'... so i won't. problem stalled.

thank you again.

paul
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post #6 of 8 (permalink) Old 04-04-2009, 12:20 AM
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I've noticed that my voltage increases from idle to about 3000 rpm, then it starts to decline just a touch from 3000 to 5000 rpm. Is this a potential problem?

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post #7 of 8 (permalink) Old 04-04-2009, 01:46 AM
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Quote:
Originally Posted by rubyrick View Post
I've noticed that my voltage increases from idle to about 3000 rpm, then it starts to decline just a touch from 3000 to 5000 rpm. Is this a potential problem?
Depends on what your voltage is, normaly once your voltage hits 14.5v the R/R will bleed off excess voltage.


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post #8 of 8 (permalink) Old 04-04-2009, 04:24 AM
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Quote:
Originally Posted by global_recon View Post
and at the multimeter right on the battery start at 12.5v or so during idle and then go up to 14v at about 5000rpm. soo....



thank you again.
That's what you should see happening, and if it continues to climb approaching/reaching 16v then the battery will cook, and indicates a problem again. Sounds like its working fine now.

And that would be the best way to check a bikes voltmeter; get a hand held unit and check the voltage at the battery, at idle, and then throttled up to 2500, 3500-4000, etc.

And a low or slightly low reading could be something as simple as a bad/loose/dirty connection somewhere.

Last edited by 750Doug; 04-04-2009 at 07:56 AM.
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