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Newbie Question: High Beam/Low Beam

Discussion in 'Electronic Basics' started by MeezerMan, Sep 20, 2005.

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  1. MeezerMan

    MeezerMan Guest

    Total and absolute newbie alert!

    I'm putting an old motorcycle back on the road and to pass inspection
    it must have both high and low beams. The original light that was
    there had a ground an two positives. Dual filament, maybe? I think it
    was 65 watts if memory serves. Now I have an automotive fog lamp in
    there and it works very well but I only have a high beam. Single
    filimanet bulb? So, I wonder if there's a way to give both high and
    low with this lamp?
     
  2. DJ Doc

    DJ Doc Guest

    | Total and absolute newbie alert!
    |
    | I'm putting an old motorcycle back on the road and to pass inspection
    | it must have both high and low beams. The original light that was
    | there had a ground an two positives. Dual filament, maybe? I think it
    | was 65 watts if memory serves. Now I have an automotive fog lamp in
    | there and it works very well but I only have a high beam. Single
    | filimanet bulb? So, I wonder if there's a way to give both high and
    | low with this lamp?

    No !

    In addition to the two filaments having different wattage, the focal points
    are not the same.
     
  3. John G

    John G Guest

    Depends on the structure of the reflector.

    Earlier car and M/C lamps were sealed beam and had the 3 connections as
    you mention. If you can find one that fits you are in bussiness.
    Later lamps take a bulb with the filaments offset as suggested and again
    have 3 connections.

    Describe your lamp size better and ask in rec.autos.tech or post a
    picture somewhere.
     
  4. Rich Grise

    Rich Grise Guest

    Not that would pass inspection.

    Bite the bullet, and get a proper motorcycle headlight.

    Sorry,
    Rich
     
  5. DJ Doc

    DJ Doc Guest

    | MeezerMan wrote:
    | > Total and absolute newbie alert!
    | >
    | > I'm putting an old motorcycle back on the road and to pass inspection
    | > it must have both high and low beams. The original light that was
    | > there had a ground an two positives. Dual filament, maybe? I think it
    | > was 65 watts if memory serves. Now I have an automotive fog lamp in
    | > there and it works very well but I only have a high beam. Single
    | > filimanet bulb? So, I wonder if there's a way to give both high and
    | > low with this lamp?
    | since you already have the wire for both levels you can
    | simply use a string of diodes rated for the lamp in series
    | to reduce the drive from the low beam wire to the lamp and
    | have the high been wire simply connect directly to the lamp which
    | will by pass the low line.
    | each diode will drop your voltage about 0.6 volts.
    | etc.
    |

    That would not pass the inspection.

    The High beam is focused higher than the low beam, and very often they are
    the same wattage.
     
  6. No - this is not an acceptable solution.

    Low beam and High beam headlight have different "aims" or beam shape -
    not just (or not necessarily) different intensities.



    --
    Peter Bennett, VE7CEI
    peterbb4 (at) interchange.ubc.ca
    new newsgroup users info : http://vancouver-webpages.com/nnq
    GPS and NMEA info: http://vancouver-webpages.com/peter
    Vancouver Power Squadron: http://vancouver.powersquadron.ca
     
  7. Jamie

    Jamie Guest

    since you already have the wire for both levels you can
    simply use a string of diodes rated for the lamp in series
    to reduce the drive from the low beam wire to the lamp and
    have the high been wire simply connect directly to the lamp which
    will by pass the low line.
    each diode will drop your voltage about 0.6 volts.
    etc.
     
  8. ehsjr

    ehsjr Guest

    Plus the light color would change - more yellow at lower
    voltage.

    Ed
     
  9. Bill

    Bill Guest

    Why not fix it right so that you aren't a menace to yourself or anyone
    else on the road?

    -wlb
     
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