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Discussion Starter #1
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)
 

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and the Adventure Cycle
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6,141 Posts
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?
 

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Premium Member
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5,236 Posts
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
 

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Undercover Sportbiker
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1,097 Posts
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.
 

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Linkmeister Supreme
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7,960 Posts
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.
 

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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.
 

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and the Adventure Cycle
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6,141 Posts
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.
 
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