Electrical problem when warm - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Where does this wire go?
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post #1 of 7 (permalink) Old 05-31-2016, 03:41 PM Thread Starter
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Electrical problem when warm

I've had some electrical gremlins since last summer. Starter would not engage. So, coming out of hibernation this spring, I cleaned up the start switch and checked a couple items but couldn't tie it down. I think it is worse this year and want to get it solved before I head to StrangeDays.

Symptoms--occasionally wouldn't engage starter when cold. By this I mean there was nothing to the starter. I would cycle the clutch a couple times, tap the gear shift (even when neutral light was engaged), tap the kickstand, etc and then it would fire up. I think this has mostly gone away since cleaning the switch . (Which of course means all the actions above were mostly voodoo unrelated to the real problem?)

The part that I can't seem to tie down--start it up and let it idle and it eventually dies. The shutdown may be due to carb tuning (idle is really too low) because if I shut down hot I sometimes get the same result--no starter until it cools down. I can jump the solenoid and it cranks fine. I can have it on a booster/charger and it still won't crank until it cools. Pretty sure its not the solenoid--will verify tonight for sure.

Anyone seen this and can speed me up on my trouble shooting? Also having turn signal troubles so I'm going to be digging into the relay box anyway. May just swap it out anyway but seems an expensive way to troubleshoot.
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post #2 of 7 (permalink) Old 05-31-2016, 04:28 PM
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Have you looked into the two wire mod?

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post #3 of 7 (permalink) Old 05-31-2016, 09:17 PM Thread Starter
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Will look into the 2 wire mod tomorrow. Thanks!
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post #4 of 7 (permalink) Old 06-01-2016, 10:59 AM
..have a vulcan good day!
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side stand switch ? - -

Switch at the Clutch lever ? - -

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 06-01-2016 at 11:17 AM.
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post #5 of 7 (permalink) Old 06-02-2016, 02:40 PM
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Grounds...grounds....check ALL the grounds!!!
Physically remove the frame grounds and clean and re-tighten them.
What might appear to be a good ground could be bad due to oxidation on the threads of the bolt.
The starter ground is through the case...so check those bolts as well.
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post #6 of 7 (permalink) Old 06-02-2016, 03:19 PM
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Might be a bad wire connection problem. As stated before it could be a bad ground or other bad connections. If I remember correctly, electricity flows better in the cold than hot. Possibly on your bike, when it's cold, there is enough electricity flowing through, but when its hot, then there is more resistance and there is not enough to start the bike. Obviously this difference is not big enough that you will encounter it on a regular basis, but maybe, just maybe, if there was a bad connection, like a corroded wire connection, then that along with the hot temp prevents enough electricity to start the bike.

Even if this is not the reason for your troubles, its still a good idea to clean your connections. Since the bike just came out of hibernation, it is very possible that some connections have rust on them or corrosion.

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post #7 of 7 (permalink) Old 06-05-2016, 11:06 PM Thread Starter
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Cleaned the connections, did some other maintenance and problem seems to have gone away. Strange thing is I blipped the start button while running and starter ticked. I had looked into the two wire mod but my 10 pin connector shows corner pin as black/red, next up is all black, and middle is yellow/red so I couldn't quickly figure out how to do the mod. So UNMODIFIED, its like the shutout is no longer functioning. Something is flaky. One new mod is a voltage meter with two USB outputs. Went in easy! Voltage outputs are fine on system with 13.8V at idle 14.4V at 2K RPM. I did clean up the wiring to the stator --had some old connectors that looked needy.
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