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  #1 (permalink)  
Old 05-19-2009, 06:35 PM
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Headlight keeps burning out ?????

Does anyone have experience with a haedlight keep burning out?
The bulb is a H4. The voltage was taken on the wires with the bike off reading 11.7v - The readings with the bike running and the throttle up a little was 12.9v
What is the voltage supposed to be with the throttle up? I was thinking its a high voltage problem or possibly the vibrations knocking the bulb out?
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  #2 (permalink)  
Old 05-19-2009, 06:37 PM
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Sorry - Its headlight not haedlight...Im tired
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Old 05-19-2009, 06:40 PM
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Quote:
Originally Posted by bhfd1335 View Post
Does anyone have experience with a haedlight keep burning out?
The bulb is a H4. The voltage was taken on the wires with the bike off reading 11.7v - The readings with the bike running and the throttle up a little was 12.9v
What is the voltage supposed to be with the throttle up? I was thinking its a high voltage problem or possibly the vibrations knocking the bulb out?
Normal voltage with a fully charged battery is 12.75v

Charging at 2000-2500rpms, should be around 14.25v

So, you're battery is low - to start with



But the most common causes of H4 bulbs blowing is vibrations or a faulty ground

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Old 05-19-2009, 06:42 PM
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Had the same type of issue, It was a bad ground. a loose connection where the ground wire was riveted to the headlight housing. Went through 3 bulbs before I found it.
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Old 05-19-2009, 06:44 PM
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H4's are notorious for burning out with vibrations?
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Old 05-19-2009, 06:45 PM
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Quote:
Originally Posted by Merlin Hawaii View Post
But the most common causes of H4 bulbs blowing is vibrations or a faulty ground
Damn,,,, you beat me......

Last edited by Scum; 05-19-2009 at 06:47 PM..
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Old 05-19-2009, 06:48 PM
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I havent checked the ground connection....I will do that tomorrow. I didnt realize that the voltage gets that high with the engine RPM at 2000. The bulb rating states 12.8v 55W.
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Old 05-19-2009, 07:30 PM
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Do not touch the bulb with your fingers when installing.
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Old 05-19-2009, 07:37 PM
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I don't know about H4's specific problems, but it is the amperage that burns shit out, not the voltage. Light bulbs, motors, basically anything that draws a set WATTAGE will draw excessive AMPERAGE if supplied with low VOLTAGE. Basically, if your battery and/or charging system is supplying low voltage, by design they will draw excessive amps in order to achieve the wattage required to perform it's function...which will cause things to burn out.

It's the same reason a bad ground causes bulbs to fry...voltage has to split between two loads, so low voltage is available to the bulb itself.

If you measure voltage from the ground side of the bulb, to your battery ground...that is your ground side voltage drop, and it should be zero (or damn close), otherwise you have a bad ground.

Last edited by bobjutsu; 05-19-2009 at 07:42 PM..
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Old 05-19-2009, 07:46 PM
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Had the same problem. If your headlight is grounded to the bucket, it will continue to blow out. I ran a ground wire from my headlight to my main ground and I haven't had a problem in years.
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Old 05-20-2009, 03:33 AM
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yup, i had that happen....H4 kept burning out

had a short
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Old 04-19-2017, 07:11 PM
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my apologies on resurrecting an old thread, but I've gone threw 2 H4 bulbs so far; my ground is to the headlight bucket, but it's not loose or corroded; when I pulled the bulb out both times, it didn't look burned at all; the very fine strand of metal (or whatever) that holds the coil in the light itself is broken...that's happened both times; so with no indication of burning (not black), does that mean it's the vibration just simply shaking the shit out of the light and causing that microscopic strand to break and thus "blow" the bulb?
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Old 04-20-2017, 02:28 PM
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When a voltage ..electrical pressure..flows through a wire...resistance..it creates current..measured in amperes...principal founded by Mr. Ampere....and calculated by ohms law.
Current flow is the work horse that makes an appliance work...light bulb..motor etc...
picture current as water flowing through a hose to operate a sprinkler.
water = voltage electron pressure...wire = hose, size of hose = resistance.....amperes..final force to the sprinkler..
Wattage is simply a math calculation used to measure the power used and dissipated as heat of a circuit or appliance..How POWERFUL is this circuit....or to charge you for your home electric meter..with out a wattage calculation, they couldn't do that...If you have a bad ground, you will tend to have higher voltages and less current flow...no circuit connection = no current flow = no voltage drop........but an intermitant ground can cause your bulb to fluctuate widely...spikes ...same reason they don't recommend disconnecting your battery cable from your car when the engine is running, you can burn components..with the voltage spikes..so ..just because you are reading a certain voltage with your volt meter doesn't mean it is the same riding down the road..when ground is vibrating or rusty..loose..one other thing, it is not necessarily the spikes in voltage that would do the harm, not to a light bulb, a static sensitive semi conductor ,integrated circuit etc..yes, but not a simple coil of wire..it would be the sudden ground when it finally connects on the spike...results..high current spike..then heat and vibration..
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Last edited by Shovel52; 04-20-2017 at 06:28 PM..
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Old 04-20-2017, 04:29 PM
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I always run a ground wire for the headlamp/forks directly to the frame.
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Old 04-20-2017, 04:39 PM
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like to do that with all lights too.
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