Could a VN750 run wihout the battery? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 24 (permalink) Old 05-02-2016, 04:15 PM Thread Starter
I'm a rider
 
One1's Avatar
 
Join Date: May 2014
Location: Signal Mountain, TN
Posts: 764
iTrader: (0)
 
Garage
Could a VN750 run wihout the battery?

I haven't reviewed how the battery and charging system interact so I don't know what runs off the battery and what runs off the stator.

I used to have a 250cc scooter that would jump start off and run on the stator, but the turn signals and brake light wouldn't operate. Still it would get you home with a dead battery.

I was just curious if my bat died if the Vn would run without one in it, IE- tossing the bad battery if it had a bad cell bringing the system down and running home without it.

Loved that scooter I had, got me home every time dead battery or not . Just jumped it off and took off.


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
One1 is offline  
Sponsored Links
Advertisement
 
post #2 of 24 (permalink) Old 05-02-2016, 04:28 PM
1986 VN750
 
thtanner's Avatar
 
Join Date: Nov 2011
Location: Dana Point, CA
Posts: 3,255
iTrader: (8)
 
Garage
You can run with the battery disconnected (some have done it for troubleshooting). Not sure of the long term ill effects.

I've bump started my bike and rode home with a dead battery.
One1 likes this.

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
thtanner is offline  
post #3 of 24 (permalink) Old 05-02-2016, 04:29 PM
Senior Member
 
RoadHopper's Avatar
 
Join Date: Oct 2015
Location: Los Angeles - Central
Posts: 570
iTrader: (0)
 
Garage
Quote:
Originally Posted by One1 View Post
I haven't reviewed how the battery and charging system interact so I don't know what runs off the battery and what runs off the stator.

I used to have a 250cc scooter that would jump start off and run on the stator, but the turn signals and brake light wouldn't operate. Still it would get you home with a dead battery.

I was just curious if my bat died if the Vn would run without one in it, IE- tossing the bad battery if it had a bad cell bringing the system down and running home without it.

Loved that scooter I had, got me home every time dead battery or not . Just jumped it off and took off.

Battery might last 5 hours or so... depends on how many lights you're using. The system is SUPER simple... basically the battery starts the engine running, turns the rotor and then the stator simply keep charging the battery full tilt with whatever its got. Anything that the battery can't use, is wasted into the heatsink of the R/R.


So basically you got this....in a nutshell...

3 wires of 3 phase 50volts peak to peak going into the R/R.
2 wires of 14..6volts coming out of the R/R straight on over to the poles on the battery. ( in an ideal world ).
Battery supplies everything unless the key is turned off, with only one exception.
The fan relay and the fan itself will both run regardless of the ignition key switch.

An "ideal" stator will put out about 336 watts if you are running at 8000 RPM ( according to the manual ). Your headlamp will pull 5 amps at 60 watts, though too.

Hope that helps.

1987 VN750 California - "Lydia"
Reupholstered leather seat w/matching lockbox.
Rebuilt battery cage
Relocated R/R
AGM battery
Murican MCCT
Redesigned Rear - LED Tag/Signals/Harness
RoadHopper is offline  
 
post #4 of 24 (permalink) Old 05-02-2016, 04:49 PM
Expendable newbie
 
evulcannibal's Avatar
 
Join Date: Apr 2016
Location: Fresno, CA
Posts: 309
iTrader: (0)
 
Garage
Quote:
Originally Posted by thtanner View Post
You can run with the battery disconnected (some have done it for troubleshooting). Not sure of the long term ill effects.

I've bump started my bike and rode home with a dead battery.
How did you bump started the bike?
Did you do it in second gear or first since it won't let you go out of neutral?
How fast were you going, running speed in a straight road or down a hill?

Don't take my word for it. I'm just a foolish newbie.
When in doubt, just know that I am only joking around.

95 VN750
Top speed is 112 mph at ~7900 rpm
Blacked out engine
Dry rusty splines finally lubed for the first time
R/R relocated to the side of fuse box
Rust removed from tank
Marbled
In line fuel filter, 23-28 micron rating
Voltmeter
Gear indicator
LED turn signals & brake light
16 color LED engine light up & underglow
evulcannibal is offline  
post #5 of 24 (permalink) Old 05-02-2016, 04:53 PM Thread Starter
I'm a rider
 
One1's Avatar
 
Join Date: May 2014
Location: Signal Mountain, TN
Posts: 764
iTrader: (0)
 
Garage
Quote:
Originally Posted by evulcannibal View Post
How did you bump started the bike?
Did you do it in second gear or first since it won't let you go out of neutral?
How fast were you going, running speed in a straight road or down a hill?
It seems like I have been able to put mine in second sitting still with the bike off...... maybe I'm remembering wrong. Second would be much easier to make it start.


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
One1 is offline  
post #6 of 24 (permalink) Old 05-02-2016, 05:01 PM
Senior Member
 
RoadHopper's Avatar
 
Join Date: Oct 2015
Location: Los Angeles - Central
Posts: 570
iTrader: (0)
 
Garage
Quote:
Originally Posted by One1 View Post
It seems like I have been able to put mine in second sitting still with the bike off...... maybe I'm remembering wrong. Second would be much easier to make it start.
Ive tried it with a "slight hill". It just don't have the speed for my nubby legs...

I suspect if you got the hang of it in 2nd or 3rd, it would be a cinch after awhile.

1987 VN750 California - "Lydia"
Reupholstered leather seat w/matching lockbox.
Rebuilt battery cage
Relocated R/R
AGM battery
Murican MCCT
Redesigned Rear - LED Tag/Signals/Harness
RoadHopper is offline  
post #7 of 24 (permalink) Old 05-02-2016, 05:02 PM
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,045
iTrader: (0)
 
Garage
The battery and r/r are basically in parallel with each other when the motor is running. Shouldn't be a problem running without a battery once the bike is started.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is offline  
post #8 of 24 (permalink) Old 05-02-2016, 05:06 PM Thread Starter
I'm a rider
 
One1's Avatar
 
Join Date: May 2014
Location: Signal Mountain, TN
Posts: 764
iTrader: (0)
 
Garage
I figured it out you can put it in first then try to push start it and when it doesn't work take it up into second. That seems to work just now by curiosity I was testing it


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
One1 is offline  
post #9 of 24 (permalink) Old 05-02-2016, 05:20 PM
Senior Member
 
RoadHopper's Avatar
 
Join Date: Oct 2015
Location: Los Angeles - Central
Posts: 570
iTrader: (0)
 
Garage
Quote:
Originally Posted by Thorn View Post
The battery and r/r are basically in parallel with each other when the motor is running. Shouldn't be a problem running without a battery once the bike is started.
That's "hopefully" the case, and it depends on everything else of course, but by design, if it were otherwise, then the battery would always need to be charged after somebody rode the bike.

By the way... i finished that R/R for you last night. I'll probably post it up later...

1987 VN750 California - "Lydia"
Reupholstered leather seat w/matching lockbox.
Rebuilt battery cage
Relocated R/R
AGM battery
Murican MCCT
Redesigned Rear - LED Tag/Signals/Harness
RoadHopper is offline  
post #10 of 24 (permalink) Old 05-02-2016, 05:33 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,565
iTrader: (5)
   
Quote:
Originally Posted by One1 View Post
I figured it out you can put it in first then try to push start it and when it doesn't work take it up into second. That seems to work just now by curiosity I was testing it
The problem is, with the neutral finder, you have to get it rolling over in 1st, then hit 2nd while still keeping enough momentum/speed to do any good.

Hard to do alone, but have done it on the Kawi LTD with two people pushing.

Good to know though, bump starting is an option with a dead battery. I figured it might stall if you let it down to idle.

Wonder what happens if the fan comes on at idle?

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
Spockster is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome