headlight dims with brake - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
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post #1 of 8 (permalink) Old 07-18-2013, 09:50 AM Thread Starter
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headlight dims with brake

Sorry if I have overlooked any other post on this. When riding and appling the brakes the headlight dims. Is this my stator getting week or is the problem the voltage regulator? Any help or suggestions are appreciated..
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post #2 of 8 (permalink) Old 07-18-2013, 10:00 AM
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Quote:
Originally Posted by vulcan2002 View Post
Sorry if I have overlooked any other post on this. When riding and appling the brakes the headlight dims. Is this my stator getting week or is the problem the voltage regulator? Any help or suggestions are appreciated..
IMO......Maybe neither.
What Stator are u running...Stock ?
What R/R are u using....stock ?

What rpm does this only occur @ /or near idle rpm ? 1000 - 1500 rpm ?

Does the headlight dim at 3K rpm ?

...just some thoughts.

You may have wiring harness issues.


'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; 07-18-2013 at 12:51 PM.
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post #3 of 8 (permalink) Old 07-18-2013, 10:03 AM
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Could be a weak battery. Do you have an AGM battery?

Check the battery (and connections) then check your charging output with the bike running....

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post #4 of 8 (permalink) Old 07-18-2013, 11:26 AM Thread Starter
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the whole bike is stock except for k&n air filters.... as for the battery hadn't thought of that as it cranks right up... but can sometimes be stubborn to start and wants to flood.. Weak spark maybe? thanks for the input!!! and anymore is appreciated!
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post #5 of 8 (permalink) Old 07-18-2013, 11:38 AM
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Quote:
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the whole bike is stock except for k&n air filters.... as for the battery hadn't thought of that as it cranks right up... but can sometimes be stubborn to start and wants to flood.. Weak spark maybe? thanks for the input!!! and anymore is appreciated!
You also could do what I did. Our stock brake light bulbs draw 3.5 amps when braking. I put in LED bulbs and only draw .3 amps when braking.

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2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
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post #6 of 8 (permalink) Old 07-18-2013, 11:43 AM
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Quote:
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a wiring harness issues.

I just finished removal and complete dis assembly of my VN wiring harness.

'06 bike w/4k, and can state-there are issues with stock wiring. My headlight will dim at idle with no good way around it. It loses a least 1v to the headlight at all times.

I am back on the road. I am now ready to reinstall a reserve lighting devise and can not imagine it will gain power to the headlight.

Last edited by wmsonta; 07-18-2013 at 11:45 AM.
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post #7 of 8 (permalink) Old 07-18-2013, 11:59 AM
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Quote:
Originally Posted by wmsonta View Post
I just finished removal and complete dis assembly of my VN wiring harness.

'06 bike w/4k, and can state-there are issues with stock wiring. My headlight will dim at idle with no good way around it. It loses a least 1v to the headlight at all times.

I am back on the road. I am now ready to reinstall a reserve lighting devise and can not imagine it will gain power to the headlight.
X100 I love the bike except for the freaking electrical system.

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
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post #8 of 8 (permalink) Old 07-18-2013, 12:13 PM
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X100 I love the bike except for the freaking electrical system.
Well, I don't looove the City Girl. If she loved me, i would have been able to ride over the recent holiday's.

Testing (because it was easy to do) shows the headlight 'brightens' just above 12.5v. The visceral input is that there is just bright and idle. Bright occurs about 1500-1700rpm's. So...I intend to use my headlight like a volt gauge.
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