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

LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 08-04-2009, 11:26 PM Thread Starter
Join Date: Aug 2009
Posts: 1
iTrader: (0)
Headlamp Issues

Hey everybody,

I don't own a motorcycle, my father does (Vulcan) so I am trying to help him figure out his dead headlight. The bike gets power to everything except the front headlight.

The one thing we notice is that the schematic we have for the bike shows only one red/yellow connection between the headlight and the dimmer switch, yet the bike it self has many red/yellow connections throughout the entire bike, which either means the bike was wired with the wrong coloring or the schematic we are using is not for the right model.

How can I tell what model bike we have to make sure we have the correct schematic? The maintenance record shows the following engine number "VN750AE052001" but I cant find anything referencing that model. Is there a way we can identify the model of this bike?

The current book we are using for schematics is:
CLYMER - Kawasaki 700-750cc Vulcan 1985-2001 Service - Repair - Maintenance (M356-2)
lauerja is offline  
Sponsored Links
post #2 of 7 (permalink) Old 08-05-2009, 08:27 AM
and the Adventure Cycle
hyperbuzzin's Avatar
Join Date: Jun 2004
Location: Western PA
Posts: 6,138
iTrader: (1)
Hmm, yes, there should be just one red/yellow wire from the headlight to the highbeam switch, according to the wiring diagram.
Do the wires look like they may have been added by a previous owner?
I doubt it could've been wired wrong at the factory.

There is only one model of the VN750. Except for the first several years, nothing really changed much.

Is the entire headlight not working, or just the low or high beam?

AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC

"When life throws you curves,
Aim for the apex."

Author Unknown
hyperbuzzin is offline  
post #3 of 7 (permalink) Old 08-05-2009, 09:11 AM
Members who have donated towards server costs
denny6006's Avatar
Join Date: Mar 2009
Location: InezKY pop.600
Posts: 5,236
iTrader: (9)
at the head light it should have a red /yellow that goes to the dimmer switch a solid red wire going to the reserve lighting device and black /yellow that will be battery- (ground and if you will give me the frame number I can tell you what year it is ,if it is a2001 there is a supplement to the wiring diagram in the factory manual,Denny

If you see it on my bike I did it
92 vn750(sold)
Current ride 05 1500 Classic FI
lovin' the new scoot

"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

Psalm 40:1...
XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
denny6006 is offline  
post #4 of 7 (permalink) Old 08-05-2009, 10:45 AM
Undercover Sportbiker
AJCruzin's Avatar
Join Date: Oct 2007
Location: SoCal (SF Valley) 91343
Posts: 1,097
iTrader: (19)
There's a farily simple way to check if it's the wiring. Aside from a visual inspection of the wires and the connections, you can swap one of the wires in the 8 pin plug on the left (as you sit on it) side of the bike attached to the battery box. IIRC< it's the blue wire, pop the spade out of its slot and move it over to the next slot. Turn the key on, and if the headlight comes on then the problem is in all likelihood the headlight relay, which is inside that junction box, and is not replaceable unless you buy a whole new box. There was some talk of people experimenting to see if they could get the box open and do the relay swap without destroying it, but IDK if it was ever done successfully. You're definitely in the right place to get this fixed, though. ALong with any other issues that may come up. For more on this, do a search for "headlight relay" +blue and you should get some hits.

AJCruzin is offline  
post #5 of 7 (permalink) Old 08-05-2009, 03:18 PM
Linkmeister Supreme
OlHossCanada's Avatar
Join Date: Aug 2008
Location: Lethbridge, Alberta, Canada
Posts: 7,960
iTrader: (8)
There is a label on the rear fender of my bike, under the seat, with the model number A-7 for a 1991 model year. First year of manufacture was 1985= A-1, last year was 2006=A-21. Hope this helps.


1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15

OlHossCanada is offline  
post #6 of 7 (permalink) Old 08-05-2009, 03:43 PM
Members who have donated towards server costs
ChrisC's Avatar
Join Date: Apr 2008
Location: Wayne, NJ
Posts: 405
iTrader: (3)
When you say everything else has power, have you checked to see if the bike is generating enough to charge the battery. When I was having electrical system problems last year, one of the symptoms was the headlight not working. Bumping the starter while the bike was running turned it on. Just something to check I guess. i'd put a VOM on the battery to check the voltage @idle and @~4k RPM to make sure that it looks healthy.

Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
ChrisC is offline  
post #7 of 7 (permalink) Old 08-05-2009, 03:51 PM
and the Adventure Cycle
hyperbuzzin's Avatar
Join Date: Jun 2004
Location: Western PA
Posts: 6,138
iTrader: (1)
Gotta also ask....
You aren't having headlight problems with the bike NOT running, are you?
If so, the headlight does not come on until the bike is running.
And, like Chris mentioned, check the charge of the battery when the bike is running.
A bad stator will cause the headlight not to work.

AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC

"When life throws you curves,
Aim for the apex."

Author Unknown
hyperbuzzin is offline  
Sponsored Links


Quick Reply

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


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

Email Address:


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