Battery Voltage = 12.5 volts - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 46 (permalink) Old 03-15-2009, 06:00 PM Thread Starter
 
Join Date: Nov 2008
Posts: 491
iTrader: (1)
 
Battery Voltage = 12.5 volts

Howdy Folks --

GOOD NEWS:: With the help of this forum, today I bought a Multimeter and
used it for the first time ever to find a problem with the Junction Block!

BAD NEWS:: I think I may have uncovered another electrical problem

Just for kicks I measured the voltage across the battery terminals = 13 volts with the bike turned off. I then started up the bike and measured across the terminals again while idling or reving the engine to about 6k rpm made no difference = 12.5 volts.

I thought I read somewhere that when you rev the engine the voltage should read about 14 to 15 volts?

I have a MF battery installed by the PO about 2 years ago. I do mainly short rides near home. Each evening I connect the bike to a battery tender plus and each morning the tender gives a green blinking light indicating the battery is charged. I may have an electrical problem and not know it.

Does this indicate a bad stator and/or R/R. What should I do next?

Sorry to be the bearer of constant bad news but I'd be lost without this forum. With your help one day maybe I will get Mr. Spock back in good Vulcan health!
FlaRider is offline  
Sponsored Links
Advertisement
 
post #2 of 46 (permalink) Old 03-15-2009, 06:06 PM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by FlaRider View Post
Howdy Folks --

GOOD NEWS:: With the help of this forum, today I bought a Multimeter and
used it for the first time ever to find a problem with the Junction Block!

BAD NEWS:: I think I may have uncovered another electrical problem

Just for kicks I measured the voltage across the battery terminals = 13 volts with the bike turned off. I then started up the bike and measured across the terminals again while idling or reving the engine to about 6k rpm made no difference = 12.5 volts.

I thought I read somewhere that when you rev the engine the voltage should read about 14 to 15 volts?

I have a MF battery installed by the PO about 2 years ago. I do mainly short rides near home. Each evening I connect the bike to a battery tender plus and each morning the tender gives a green blinking light indicating the battery is charged. I may have an electrical problem and not know it.

Does this indicate a bad stator and/or R/R. What should I do next?

Sorry to be the bearer of constant bad news but I'd be lost without this forum. With your help one day maybe I will get Mr. Spock back in good Vulcan health!

Pull the connector off the R/R and set your multimeter to AC volts. Start the bike and measure the voltage of the three yellow wires, check two at a time.



85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
post #3 of 46 (permalink) Old 03-15-2009, 06:33 PM
Sparky!!!
 
slimvulcanrider's Avatar
 
Join Date: May 2008
Posts: 8,695
iTrader: (3)
   
Garage
as lance said, just adding to it...when you check the wires go through the rpm range and the ac voltage should increase. if not then the Stator is at fault...also in the clymer manual there is a R/R torubleshooting flow chart...check all readings acrossed the r/r and compare with the manual. it could also be something as stupid as a bad ground or the jb as well... I was having a charging issue last year that ended up being a bad JB...I replaced the JB for another problem, and it just happened to fix my charging issue.
slimvulcanrider is offline  
 
post #4 of 46 (permalink) Old 03-15-2009, 08:59 PM
Members who have donated towards server costs
 
93VN750's Avatar
 
Join Date: May 2006
Location: Tampa, Florida
Posts: 1,766
iTrader: (2)
 
Send a message via Skype™ to 93VN750
In addition to above tests, check from each yellow lead to the engine case. Should read infinite, if not your stator is bad.

When the stators fail, the insulation breaks down allowing the stator wire to contact the stator core, this shunts any power immediately to ground, nothing goes to the r/r or battery.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
93VN750 is offline  
post #5 of 46 (permalink) Old 03-15-2009, 10:34 PM
Now what
 
Ironman's Avatar
 
Join Date: Jun 2004
Location: Renton, Wa. USA
Posts: 400
iTrader: (0)
 
Go to this page and download the electrical fault finding guide. http://tinyurl.com/c2zou It'll help you track down the problem.

'04 750A- and loving it!
VROC 13864
Using a Purlator One PL14610
"Sixth gear? I don't need no stinkin sixth gear!"
If someone throws you under the bus-remember to tuck and roll
Ironman is offline  
post #6 of 46 (permalink) Old 03-15-2009, 10:48 PM
Love My Baby
 
rubyrick's Avatar
 
Join Date: Jun 2008
Location: Hollywood, Florida
Posts: 1,165
iTrader: (1)
   
Also, normally there is no need to connect a battery tender to your MF battery EVERY NIGHT. Your battery should hold a charge for a long time, and you should only need to charge it infrequently. In your case however, if you have a bad charging system, charging your battery nightly might have kept you going and hidden the problem for quite a while.

Caution to those with non-maintenance free batteries: Don't connect a battery tender or other charger every night to your battery because the initial charging, even with a battery tender, will cause you to loose some fluid through the vent tube. Then before you know it your battery fluid level will be VERY LOW. You simply MUST check your battery fluid level monthly if you charge frequently, or you WILL be S.O.L. before you know it. And checking this is a royal P.I.A.

Rubyrick

MY BABY...
'05 VN750
16,000 miles +
Kawi tank bib
Kawi rear rack
Small windshield
DEKA M/F battery
VN750.com Grill Cover
LED license plate frame
Clear Alternatives LED brake light
Cortech mini tank bag on rear rack
Pirelli MT66 Tires: 110 front / 150 rear
Splines lubed when tires installed at 10,650 miles
Splines lubed again at 14,400 with stubby valve stem install

Place your mouse on the X below and drag to the O

X
Even though you can't see Him, GOD is there! O
rubyrick is offline  
post #7 of 46 (permalink) Old 03-15-2009, 11:12 PM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by rubyrick View Post
Also, normally there is no need to connect a battery tender to your MF battery EVERY NIGHT. Your battery should hold a charge for a long time, and you should only need to charge it infrequently. In your case however, if you have a bad charging system, charging your battery nightly might have kept you going and hidden the problem for quite a while.

Caution to those with non-maintenance free batteries: Don't connect a battery tender or other charger every night to your battery because the initial charging, even with a battery tender, will cause you to loose some fluid through the vent tube. Then before you know it your battery fluid level will be VERY LOW. You simply MUST check your battery fluid level monthly if you charge frequently, or you WILL be S.O.L. before you know it. And checking this is a royal P.I.A.
With a non MF battery you have to check the fluid levels every month anyway, pluged into a charger or not because of the bikes normal charging.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
post #8 of 46 (permalink) Old 03-16-2009, 01:33 AM
Love My Baby
 
rubyrick's Avatar
 
Join Date: Jun 2008
Location: Hollywood, Florida
Posts: 1,165
iTrader: (1)
   
Good point. All non-MF batteries should be checked for proper fluid levels monthly, wether or not you charge them frequently, or you WILL be stranded somewhere some day.

All MF and non-MF batteries should have their voltage checked monthly to be sure they are holding a charge well. Even MF batteries die out... they just don't loose fluid as much.

I have a battery tender quick connect cable attached to my MF battery and tucked in under the side of the seat. It's quick and easy to check the voltage by untucking the cable and connecting a voltmeter.

Rubyrick

MY BABY...
'05 VN750
16,000 miles +
Kawi tank bib
Kawi rear rack
Small windshield
DEKA M/F battery
VN750.com Grill Cover
LED license plate frame
Clear Alternatives LED brake light
Cortech mini tank bag on rear rack
Pirelli MT66 Tires: 110 front / 150 rear
Splines lubed when tires installed at 10,650 miles
Splines lubed again at 14,400 with stubby valve stem install

Place your mouse on the X below and drag to the O

X
Even though you can't see Him, GOD is there! O

Last edited by rubyrick; 03-16-2009 at 01:37 AM.
rubyrick is offline  
post #9 of 46 (permalink) Old 03-16-2009, 02:02 PM Thread Starter
 
Join Date: Nov 2008
Posts: 491
iTrader: (1)
 
Quote:
Originally Posted by lance328 View Post
Pull the connector off the R/R and set your multimeter to AC volts. Start the bike and measure the voltage of the three yellow wires, check two at a time.

Hey Lance, Slim, Jon, Ironman, and RubyRick --

Thanx for the great response! I will follow-up on your tips.

It will be a couple of days before I can work on the bike but I will post an update within 3 or 4 days.

My thanx to all!!!
FlaRider is offline  
post #10 of 46 (permalink) Old 03-19-2009, 12:33 PM
Junior Member
 
Join Date: Mar 2009
Location: N.E. Pa.
Posts: 4
iTrader: (0)
 
So, I just bought my son a '93 750.
I find this web site, (cool place), look at this posting and run home and fire up his bike.
I thought I had a bad stator, (the sons-of guns! They said they repalced it when they did the motor!),as with it running I got 12.5 volts.
I looked at my old 800 vulcan shop manual, for a "kinda idea", (the 750 shop manual is on order).
I run the tests, fire it up and then it hit me!
They say to test the output voltage with the head light fuse OUT!
So I do and sha-zam, 13.8 volts.
Makes sense, as long as it is about 12 volts with all the lights on, it's cool!
Just 1 old guys thoughts,
Joe
I ride therefore Iam!
joe28 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