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riverbendSun Jan-29-06 09:33 PM
Member since Mar 18th 2009
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"Diode for high beam indicator ?"


  

          

I have replaced the 40/45W headlight with a 50/55W H4 halogen. The high beam is bright white. The low beam is noticably more yellow. The voltage at the back of the headlight connector is the same, within .1V. The highbeam indicator light comes on at about half strength when the low beam is on.

Obviously, some voltage is finding it's way to ground at the pilot light. Has any one fit a diode between the bulb and the highbeam wire to stop this ? Does it sound that that will work ? If so, any recommendatuions on specs for a diode ?

Thanks

Greg


  

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dynodaveMon Jan-30-06 12:04 PM
Member since Mar 18th 2009
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#1. "RE: Diode for high beam indicator ?"
In response to Reply # 0
Mon Jan-30-06 12:15 PM by dynodave

  

          

ground loop problems.......super easy if you spend 35 years in electronics

Usually any problem this style is due to an inadequate ground within the head light bucket.
In an original harness:
The head light is grounded to the bucket/socket itself and should also be tied into the bikes main red harness ground.

Since the low beam (actually the whole head light) is not adequately grounded it looks for any additional ground. Specifically through the hight beam element then through the hibeam indicator bulb then to ground (probably the harness). The indicator light lights.....

If you ran a volt meter from the bucket(head lamp socket ground) to battery ground with the head light on you would see some voltage.

FWIW All commandos must have a red harness ground in/at:
headlight area
coil mount area
on the engine/head
zener
rectifier ground stud
battery
tail light area

forget the diode idea and fix your harness/ground all will be well as it should.

On second thought...rereading your symptoms the light may not be wired correctly and the wrong pin on the light may be used as ground.

  

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riverbendMon Jan-30-06 06:56 PM
Member since Mar 18th 2009
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#2. "RE: Diode for high beam indicator ?"
In response to Reply # 1


  

          

>On second thought...rereading your symptoms the light may not
>be wired correctly and the wrong pin on the light may be used
>as ground.
>

That's what it was. Somehow I thought that I was following the directions to wire the connector.... It did not make sense that the original headlight would work correctly, and the replacement would not. The headlight grounds do connect into the red wire. I think that I have most of the rest of the grounds list covered, except for the tail light.

Thanks

Greg



  

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dynodaveMon Jan-30-06 07:04 PM
Member since Mar 18th 2009
706 posts
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#3. "RE: Diode for high beam indicator ?"
In response to Reply # 2


  

          

Good thing it was that easy.
A guy was swapping out a head light from 5-1/2" hirider style to a 7" regular and fried his harness......big time ouch.
dave

  

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