confused and concerned! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
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post #1 of 27 (permalink) Old 09-22-2014, 06:21 PM Thread Starter
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confused and concerned!

Hey guys, Im not sure if I need to be concerned or not? As most of you know I just replaced my whole charging system. The other night when I completed my rebuild and started the bike it was producing voltage up to 14.55volts at 3000rpm and running the best its ever ran in my ownership, now this morning I get up to head to work on it and I noticed it was popping again on the warm up, left side to be exact! so on ride to and from work it ran great but I thought when I get home Im going to check it again and see what its producing. Low and behold its NOT! At 3000 rpm its only putting out 12.65 volts! Instead of the 14.plus that it should be. So needles to say panic just bout set in, so I cut the three stator wires from the R/R as I had solderd them and tested the stator for continuity on all three legs and all passed, started the bike ran it up to 5000 rpm and checked for a/c voltage and got 44.6, 45.1, 46.3, so that tells me its producing but I really thought it should have been higher?? I cant find the propper way to test my R/R to rule it out, I did find one video saying to disconect the negative battery lead and test for a drain of the battery with every thing off and I performed it and with the multimeter it shows I have a drain somewhere, could it be the R/R?? The video says it very well be. Im at a loss here and not sure what to do or where to start again,Ive put less than 200 miles on it since the rebuild and I do know I cant sink another 3-400 back into it again right away.

Last edited by scott42; 09-22-2014 at 06:25 PM.
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post #2 of 27 (permalink) Old 09-22-2014, 06:40 PM Thread Starter
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Ok, Those stator numbers I showed earler was a test from a groud to a leg of the stator and those were the numbers I got, I just retested all three legs to each other in all three orders and got high 60's and low 70's on the volt test.Still with no continuity.
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post #3 of 27 (permalink) Old 09-22-2014, 08:55 PM
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Quote:
Originally Posted by scott42 View Post
Ok, Those stator numbers I showed earler was a test from a groud to a leg of the stator and those were the numbers I got, I just retested all three legs to each other in all three orders and got high 60's and low 70's on the volt test.Still with no continuity.
Stator seems good.....check your R/R wire harness (pinched?)....especially the R/R connector connections.
Ensure the R/R's ground is good.
hth



btw: The case of the R/R IS NOT ground ! Think of it as a complete plastic casing.

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Last edited by WilliamTech; 09-22-2014 at 09:02 PM.
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post #4 of 27 (permalink) Old 09-22-2014, 11:05 PM
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Scott, my 1991 model has never generated anywhere near 14 VDC. The last time I tested it was 2 or 3 years ago and the highest voltage I got between 2-5k rpm was between 12.5-13.0 VDC or so. IIRC the highest voltage occurred at 3k rpm and dropped by 0.1-0.2 VDC as rpms rose to 4k-5k rpm. Not sure how to explain that anomaly.
BTW it runs perfectly from that time until today..

I have never checked the three yellow stator lines for AC voltage, so can't help you there. I seem to remember someone 3 or 4 years ago reporting AC voltages as high as the low 70s, but do not recall if that was considered excessive or normal.

Having the DC voltage start at 13.2 at 2k rpm and rise steadily to the mid 14s at 4-5k rpms is a perfect world occurrence.
Not sure how often it happens in reality.

If I have time tomorrow, I will check charging voltages again to confirm what the scoot is doing now.

EDIT: Just found paper bookmark in Clymer manual with results of voltage test done Sept 18, (no year marked down).

Engine OFF 12 v
Engine started on full choke, 1500rpm- 12.5-13v
Idle, choke off--rpm unknown--12.85 v
2k rpm--13v
3k rpm--12.78 v
4k rpm--12.75 v
5k rpm--12.75
6krpm -- not recorded

Results are close to what I remembered.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 09-22-2014 at 11:39 PM.
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post #5 of 27 (permalink) Old 09-22-2014, 11:16 PM
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hell Melissa Fahye is at 11.2 at idle right now and 12.5 @3500.tried a rectifier from the 600 ninja i just bouvht and still the same.looks like i git some work to do.

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post #6 of 27 (permalink) Old 09-23-2014, 01:07 AM
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Quote:
Originally Posted by OlHossCanada View Post
Scott, my 1991 model has never generated anywhere near 14 VDC. The last time I tested it was 2 or 3 years ago and the highest voltage I got between 2-5k rpm was between 12.5-13.0 VDC or so. IIRC the highest voltage occurred at 3k rpm and dropped by 0.1-0.2 VDC as rpms rose to 4k-5k rpm. Not sure how to explain that anomaly.
BTW it runs perfectly from that time until today..

I have never checked the three yellow stator lines for AC voltage, so can't help you there. I seem to remember someone 3 or 4 years ago reporting AC voltages as high as the low 70s, but do not recall if that was considered excessive or normal.

Having the DC voltage start at 13.2 at 2k rpm and rise steadily to the mid 14s at 4-5k rpms is a perfect world occurrence.
Not sure how often it happens in reality.

If I have time tomorrow, I will check charging voltages again to confirm what the scoot is doing now.

EDIT: Just found paper bookmark in Clymer manual with results of voltage test done Sept 18, (no year marked down).

Engine OFF 12 v
Engine started on full choke, 1500rpm- 12.5-13v
Idle, choke off--rpm unknown--12.85 v
2k rpm--13v
3k rpm--12.78 v
4k rpm--12.75 v
5k rpm--12.75
6krpm -- not recorded

Results are close to what I remembered.
Gordon, Scott here did the MOFSET upgrade when he redid his charging system, so he should be hitting 14.5Volts at ALL engine speeds. Scott, send me a pm with pictures of how your R/R is installed please
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post #7 of 27 (permalink) Old 09-23-2014, 01:20 AM
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Thanks for the info slim. I missed that in my frequent long absences from the board these past few months. From what I remember about the MOSFET r/r upgrade you are right, he should be getting over 14 vdc at all engine speeds.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #8 of 27 (permalink) Old 09-23-2014, 04:58 AM Thread Starter
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Slim I will send you some pics after I get off off work later this afternoon. Thank you guys for the info.
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post #9 of 27 (permalink) Old 09-23-2014, 02:04 PM
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Sounds good man
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post #10 of 27 (permalink) Old 09-23-2014, 05:46 PM
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Not sure if you have done it yet, but check for a short between the yellow wires and the engine case.

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