electrical problem on a new-to-me vulcan 750 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

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post #1 of 87 (permalink) Old 06-05-2012, 02:32 PM Thread Starter
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electrical problem on a new-to-me vulcan 750

hello gents, new here and could use your help. just bought a 86 vulcan 750 that has a charging problem. doesnt seem to want to charge the battery when she is running, but runs good. i checked my grounds, cleaned them up. the PO says he has already changed the stator and the rectafier, and still couldnt figure out what was wrong with it. i believe i have found the problem, found a collection of wires that were just wrapped in electrical tape that i believe use to go to some sort of rectifier or something along the likes. attached is the photo of the wires that i have found, and any help as to what they are suppose to be hooked to and where to find said part would be awesome.

PS: there are actually two groups of wires in the photo that i need help with. the group of 6 on the right, and the group of 3 yellow ones on the left. are the yellows from each side suppose to be attached to each other? if so, is there any special order to them, or do i just hooked them up?
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post #2 of 87 (permalink) Old 06-05-2012, 03:02 PM
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the 3 yellow on the right are the old wire harness stator wires...no longer used.

the 3 yellow wires on the left are the stator wires from the case, and should go to the new R/R.

the second set of wires on the R/R should go directly to the battery. all other wires are no longer used except possibly one wire that goes to the junction box to control the headlight.

I suspect you need to test the stator and R/R again.

here is a link that will help:
https://www.vn750.com/forum/showthread.php?t=21206

fill out the test flowchart that Slim made and report back so we can guide you on this.
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post #3 of 87 (permalink) Old 06-05-2012, 03:12 PM
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Looks like a MOSFET R/R. Nice.

I'd check the battery, the stator, and the R/R as well. I am not sure if the test procedure differs for the MOSFET from stock.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #4 of 87 (permalink) Old 06-05-2012, 03:20 PM Thread Starter
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i am completely new at troubleshooting wiring. the three wires on the left have been bypassed with a new set of wires, from the stator case to the R/R, now that i actually trace some wires i noticed that. am i to assume the thing under the battery is the R/R, correct? this is a test for me to see if i can actually work on these things or not, so sorry if i ask a bunch of questions. i know the battery is good, its basically brand new, not a wet type, and if i put it in my old goldwing the goldwing will charge it just fine.

Last edited by josh.wingo; 06-05-2012 at 03:25 PM.
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post #5 of 87 (permalink) Old 06-05-2012, 04:15 PM
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yup...makes sense that the new R/R is MOSFET.....this means the R/R tests will not be appropriate.

But all other tests should be ok.

with a mosfet R/R and a good stator, you should have about 14volts or better at 4Krpm
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post #6 of 87 (permalink) Old 06-05-2012, 04:36 PM
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Did you check that fuse in the pic between the R/R and battery?
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post #7 of 87 (permalink) Old 06-05-2012, 04:52 PM
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Here is a link to a website that sells the R/R it looks like you have installed on the bike. I installed one on mine. There is some good information about how it works. Something you might want to read since your interested in learning, plus you could google it. That fuse from what I understand will trip when it gets hot (shorted condition) and will reset itself when it cools down. Not 100% on that, maybe someone else knows. I know its not a fuse that just blows and u throw it away.
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post #8 of 87 (permalink) Old 06-05-2012, 06:03 PM
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I'm gonna show my ignorance and ask how you can tell what kind of R/R that is from that picture. Just for my own curiosity's sake.
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post #9 of 87 (permalink) Old 06-05-2012, 06:14 PM
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Quote:
Originally Posted by Deviate View Post
I'm gonna show my ignorance and ask how you can tell what kind of R/R that is from that picture. Just for my own curiosity's sake.
It is not stock, has three wires in and two out...... The assumption is that if you were to replace with a different R/R, it would be MOSFET....
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post #10 of 87 (permalink) Old 06-05-2012, 06:15 PM
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What is the output of the R/R going into? is that a fuse or a relay or what??
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