Start Button Won't Work - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 22 (permalink) Old 04-07-2015, 08:54 AM Thread Starter
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Question Start Button Won't Work

edit:Attention: The fix shown in post #17 will disable the safety switches on the sidestand and clutch lever.

Have been searching here and troubleshooting, now taking a break and asking for ideas, experiences, clues, even a lifeline.

Start button won't do anything. Here's what I know so far:

Key works, turns on all lights. Solenoid functions with 12v applied to the white/red wire, engine cranks

Getting 12v from Kill Switch (red wire) over to the Start button. Kill switch works.
Getting 12v out of the Start button (black/red) when Start is pushed, and also at the red plug behind the front coil (same black/red wire).

Problem: The color wiring diagram shows black/red wire changing to all black at the red plug behind the coil. Mine does not, it continues on black/red stripe. The diagram in the download manual doesn't show the junction box and also shows all black from the button to the JB.

Headed back to re-check, but I didn't find black/red at the junction box, and got no power at the black wire I tested, the diagram shows the black start wire beside a green/white, which was there.

Question:Finding no power at the Junction Box .... Does anyone know any reason I should not run a wire from the black/red up front, directly to the terminal where the white/red is at the solenoid?

The diagram also shows a red/white coming off the black start wire and running to the IC Ignitor. Which I think will means I can't terminate this start wire and run a direct wire to the solenoid.

Oh nooo, I think I'm gonna have to peel the harness. Did I mention I'm pretty much colorblind too?

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

Last edited by Spockster; 04-20-2015 at 12:03 PM.
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post #2 of 22 (permalink) Old 04-07-2015, 09:00 AM Thread Starter
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Sorry that's so long a post, just trying to give what info I have.

Coincidence? Battery has been perfect, but when I went to start it Sunday, the battery was low, and that's when I figured out the start button was also not working.

More coincidence, this all cropped up right after installing new grips and levers, which went very well and in record time.

I'll answer all questions and try any tips before I take the Sawzall to my harness.

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 #3 of 22 (permalink) Old 04-07-2015, 09:51 AM
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if you dont mind bypassing the safety switches, there is a simple wiring mod to take the 12v from the start button and send it directly to the soleniod. the run/stop and ign still work as advertised, and the side stand switch will work as advertised. done it to mine, as my j-box was becomming intermittant.

but it seems as though your problem is the 12v isnt getting to the j-box.

well, that idea seems to be a moot one.

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post #4 of 22 (permalink) Old 04-07-2015, 10:01 AM
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was it hard to get the throttle grip on if u shoved it to hard u might have cracked the start button housing on the inside and its not making contact when pushed in causing it not to start
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post #5 of 22 (permalink) Old 04-07-2015, 10:15 AM Thread Starter
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Sort of concerned also about the branching red/white that goes to the IC Ignitor. But, that black Start wire should only be energized when the button is pushed, so I dunno. It never did fire up, just a nuclear backfire out the pipes three times.

If there's no power ever getting to the red/white, I'm thinking that's another problem. So maybe I'll have to run a new wire back to where the red/white branches, and also send the new wire to the solenoid? Just bypass the junction box.

Still means I have to peel the harness. arrrgh

Edit: Error in this wiring diagram: Black/Red from start button is the same color all the way to the junction box. It does not change to all black, at the first plug, as the diagram shows. Might have to save the diagram to your computer to view it better. Hold 'Control' on your keyboard and scroll the mouse to zoom in.

Roger Tiller likes this.

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

Last edited by Spockster; 04-08-2015 at 09:04 PM.
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post #6 of 22 (permalink) Old 04-07-2015, 10:18 AM Thread Starter
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Quote:
Originally Posted by heaney750 View Post
was it hard to get the throttle grip on if u shoved it to hard u might have cracked the start button housing on the inside and its not making contact when pushed in causing it not to start
No the throttle sleeve slid on easy, and I didn't even have to loosen the cables. had the throttle grip on in four minutes.

Start button so far seems fine. But sometimes I don't have enough hands to probe, hold, and push.

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 #7 of 22 (permalink) Old 04-07-2015, 10:21 AM Thread Starter
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Maybe I should try to follow the red/white from the IC to where it joins the black, and test there.

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 #8 of 22 (permalink) Old 04-07-2015, 01:50 PM Thread Starter
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Oh no. I'm seeing another parts bike in the making. Now I get what everyone has been saying about the wiring on this machine.

Either something in the factory system is draining the battery, or the AGM batt has taken it's last ride.

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 22 (permalink) Old 04-08-2015, 08:57 PM Thread Starter
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Question Bypass Junction Box or Not?

Turns out, I have power on the black/red all the way to the Junction Box now when the start button is pushed.

The red/white off the black/red to the IC Ignitor is getting power when the start button is pushed.

The yellow/red from the JB to the starter solenoid isn't getting power out of the JB when the start button is pushed.

Any reason I shouldn't put the yellow/red and the black/red together and just bypass the Junction Box?

Thinking I can just clip the two wires off the JB plug and put them together. Any takers?

Now is when you need a good junction box tech!

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 #10 of 22 (permalink) Old 04-08-2015, 09:12 PM
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last post on this page.. way mine has been for 1.5 yrs. works well.

all safeties (except side stand) switch are bypassed by this. make sure you have it in neutral (light still works) or have clutch pulled in. it WILL crank in gear, like this.

2005 VN750

Sold 11-27-17
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