charging system problems from a newbie - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
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post #1 of 76 (permalink) Old 09-30-2018, 04:57 PM Thread Starter
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charging system problems from a newbie

Hi all,

Im the new guy here and am having the same electrical problems as others. My battery keeps running down. When I charge the battery it goes to 13.4 volts then rests at 13.2 volts.

The battery is a new gel battery and holds the charge.

When I run the bike it performs great... its' just that I seem to be using (running) off the battery and not making up the charge through the charging system.

I have done a few tests and will share them with you.

I did the stator test and got these results:
Ohm test: a1 = 0 a1 to a2 = 0
a2 = 0 a1 to a3 = 0
a3 = 0 a2 to a3 = 0

volts ac.

At 2500 rpm the voltage was
a1 to a2 = 41.7
a1 to a3 = 44
a2 to a3 = 44

I then reconnected the r/r and measured the voltage out of the r/r. It was 14.7 volts at 2500rpm.
Then I checked across the battery and got only 12.6 volts.
I then pulled the 2 light fuses and got 14.08 volts across the battery.
I don't know what to do from here. Any suggestions on what to look at next? I have moved the r/r and done thee blue wire mod.

Thanks again.
Dave
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post #2 of 76 (permalink) Old 09-30-2018, 06:41 PM
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check all your connections for corrosion/dirt/loose. even the grounds. that is a good place to start
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post #3 of 76 (permalink) Old 09-30-2018, 06:51 PM Thread Starter
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Thanks. I will do that and report back. Can I solder the bullet connectors after cleaning them?
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post #4 of 76 (permalink) Old 09-30-2018, 08:21 PM
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Quote:
Ohm test: a1 = 0 a1 to a2 = 0
a2 = 0 a1 to a3 = 0
a3 = 0 a2 to a3 = 0
This doesn't look right. Shouldn't it have a lot higher ohm readings?

The output at the r/r is great, so it seems to point to voltage loss at the JB, grounds, or JB/RR plugs. ??

Seems like your stator charges at least some of the time, but some only fail when the engine is hot. And there's also the stator leads to ground test, which should be OL or no connection to ground.

Two-wire mod could help, but I wouldn't tear into that just yet.

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__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 09-30-2018 at 08:23 PM.
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post #5 of 76 (permalink) Old 09-30-2018, 08:42 PM Thread Starter
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Thanks for the reply. I will check the stator to ground readings and get back to the forum. I will also check the voltage of the white power wiring leaving the r/r and the voltage at the white/red wire coming out of the jb. Thanks again.
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post #6 of 76 (permalink) Old 10-05-2018, 03:14 PM Thread Starter
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just a quick update. I fried the r/r aand have ordered a new one from rick's. still working the connectors and grounds. have a week to finish this as the r/r won't be here until next Friday.
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post #7 of 76 (permalink) Old 10-11-2018, 11:47 AM Thread Starter
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Hi all,
The r/r has arrived. Before I put it in and test the charging system, I have another question. When I check the continuity of the stator wires to ground my meter sounds but reads 0 ohms. When I test the resistance between stator leads I'm at about .5. Within specs and the voltage is at 50 plus. Is this looking to you like the stator is good? Thanks.
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post #8 of 76 (permalink) Old 10-11-2018, 12:08 PM
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Quote:
Originally Posted by dbeech View Post
Hi all,
The r/r has arrived. Before I put it in and test the charging system, I have another question. When I check the continuity of the stator wires to ground my meter sounds but reads 0 ohms. When I test the resistance between stator leads I'm at about .5. Within specs and the voltage is at 50 plus. Is this looking to you like the stator is good? Thanks.
What does your meter show if you connect from battery negative post to the engine block? What does it do with both meter leads touching together?

Your meter giving the sound is what I'm concerned about. That normally means there's a connection. There should be no connnection between the stator windings and ground.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #9 of 76 (permalink) Old 10-11-2018, 07:26 PM Thread Starter
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The meter reacts the same 0 reading and tone. Someone said that a tone might be okay if the meter is sensitive, but I'm thinking the stator may be bad. It is producing enough ac volts but I am only getting 12.6 to 12.8 across the battery. If I remove the headlight and taillight fuses in the junction box all voltages trend upward toward 14+ volts. I am so confused. By the way, thanks for the help.
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post #10 of 76 (permalink) Old 10-11-2018, 08:41 PM
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Question

Well, if I haven't gotten confused myself, it looks like the stator is shorted to ground. But I don't see how you could get any of those voltage readings with a shorted stator.

Can you borrow another meter?

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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