Headlight Burning Out Excessively...

[Glider-Rider]

I have an 08 fxdc and just burned out my 3rd. HD headlight, and 1 after market light. I always have my brights on during the day for better visability. I have had the electrical system checked and everything was ok. I'm at a loss. Does anyone have any suggestions? Any help would be greatly appreciated!

 

[glider]

Is there any signs of melting on the plug for the light? Could be a bad connection.

 

[Hoople]

I have an 08 fxdc and just burned out my 3rd. HD headlight, and 1 after market light.

You have gone through (4) H-4 replacement bulbs? Three of which were HD brand?

 

[bc45]

Could You be touching the glass part of the bulb? if you touch the glass your finger prints will etch the glass and shorten bulb .

 

[Blue Wide Glide]

Excess vibration at certain speeds will cause the bulbs to fail. I was constantly replacing the left passing lamp bulb in my Springer, never the right, only the left.

 

[TripleJ]

Could You be touching the glass part of the bulb? if you touch the glass your finger prints will etch the glass and shorten bulb .

Exactly what I was thinking.

 

[Glider-Rider]

Always been very careful not to touch the bulb. I have gone through (3) H-4 replacement bulbs and 1 after market and I's getting ready to put in a new bulb. There has not been any sign of overheating, scorching, or melting.

 

[HarryB737]

Check to make sure your headlight is also tight. Seems to me there was an issue with some rivets coming loose on one model, but I don't remember which one it was. Also I always use bulb grease in the terminal to assure no looseness and good continuity there. I've had good luck with Sylvania "LL" Long life bulbs, they may be constructed around a little higher voltage rating, which will allow longer life also.

 

[Hoople]

I have had the electrical system checked and everything was ok.

I know that's what they told you, but I would place a voltmeter across the battery and hold an RPM of ~ 3200 and see what the peak voltage is. Check to see what it is yourself. Try to use a quality meter on the 20 volt scale in order to read to 2 places..

 

[TXMikey]

I have similar issues on my 08 Streetglide. It always burns out the high beam filament, never the low beam. Since I run my high beam during the day, I was thinking the high beam filament just has a shorter lifespan because of the higher wattage it carries. It is a frustrating, and expensive, issue having to replace the bulb so often.