Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums - Reply to Topic
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

Thread: Only runs while start button pressed.... Reply to Thread
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  Topic Review (Newest First)
01-13-2013 08:56 AM
ifixf18s ok, if your stator wires now go from the stator directly to your R/R (bypassing the original stator wires) your headlight will not operate, but lets not worry about that untill we fix the starting issue. The other 3 wires on the R/R connector should be cut and taped up, keeping them seperated.
im assuming your bike was ok before you did all the work, so more then likely you did something in the process wether on purpose or by mistake not realizing it.
01-13-2013 12:53 AM
enthdimension hey thanks guys, been busy, and be traveling out of town for a couple days... I'll be checking it when I get back. as far as wiring, I had cut away the old three stator wires that come out of the main wirebunfle along with a few that connected to the old RR. but I may have done something silly, so ill look carefully then... thanks again
01-12-2013 08:07 PM
ifixf18s Was mainly concerned what he did with the original bike wiring.
01-12-2013 06:47 PM
dariv ^ in post 13 he says he connected the R\R directly to the battery....
01-12-2013 06:32 PM
ifixf18s I'm curious how exactly the MOSFET was installed as far as the wiring. When I did mine the battery wires and the brown wire were cut at the R/R connector capped and stowed. The new battery wires was used to connect the MOSFET leaving the rest of the original battery wires as they were, meaning I left the original battery wires attached to the battery.
01-12-2013 11:46 AM
dariv The start/stop seems ok since the bike cranks and runs. Also checked voltage at the coils and ignitor with key on and it is good.
I don't know what I'm missing here, and any help is much appreciated.
01-12-2013 11:38 AM
ifixf18s Wow tried to follow what advice you have been given and from what i can see it all makes sense, not trying to be funny here just trying to understand. hoping a new set of eyes on the problem could be of any help. One other thing in common to the ignition and the starter circuits i havent seen mentioned yet is the engine stop/starter switch assy. Has that been throughly checked out? I dont know how its constructed but could it be messed up internally? corroded?
01-12-2013 11:00 AM
dariv Yeah, that is one of the things we covered.... he said he broke a pickup wire and repaired it. the pickups have the propper resistance and the bike does run, just not when you let out the start button. strange.....
01-12-2013 10:43 AM
ifixf18s I read the first post, where you mentioned changing out the R/R and doing the stator mod. Not sure if this was mentioned, I didn't read every reply. Seems you didnt have this problem before you did all that work? Is it possible you damaged some wiring in the process? There seems to be a lot of good advice on here however I have not looked into what could be causing your problem.
But sometimes you can get so involved troubleshooting a problem you miss the obvious stuff. So you have to take a step back and look the easy stuff.
01-12-2013 09:52 AM
dariv How the battery?
Here are my thoughts.....
on the 6 pin connector you have:
black/yellow.... grounds to battery
Black/white.... grounds through safety switches via JB
red/white... 12vdc from start button. only when button is pressed
red... 12vdc. always hot with ignition switch on. also powers coils
green.... ground signal from ignitor to coil 2
black... ground signal from ignitor to coil 1

4 pin connector:
black/white and black/red...... pickup coil (rear)
black and black/yellow.... pickup coil (front)

Power flows from the battery to the JB via white/red.
LEaves JB on white wire going to ignition switch.
with ignition on, power goes to start/stop switches via yellow/red wire.
yellow/red goes to stop switch first, then branches out to start button and power to coils and ignitor via red wire.
when start button is pressed, power goes to JB (black) and also ignitor (red/white)
in the JB the black wire energizes the start relay (assuming proper safety switch operation)
There is also a black/white wire from the ignitor to the JB that must be grounded for there to be spark (the blocking circuit)
Since the bike runs with the start button pressed, it seems to have something to do with that red/white wire that only gets power with the button pressed...

I guess I would go through it all again...
black/yellow to ground
black/white to ground
red to 12v
red/white to 12v, when button pressed
red on coils 12v

it would seem the pickups are OK, since it does run.....
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