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Thread: Running without headlight

  1. #1
    Senior Member Tjmay's Avatar
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    Running without headlight

    There was a recent reference to this but it didn't really answer the question.

    I ride mostly offroad and only during the day.

    So, I disconnected the connection to the low beam knowing that if I needed the headlight, I could simply switch on the highbeam.

    Will constantly running without the load the headlight places on the system cause any harm to the battery?

  2. #2
    Super Moderator Purple's Avatar
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    No - that's what your regulator/rectifier is for ......
    PlacerLode and JerseyJeeper like this.
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    Senior Member RockyTFS's Avatar
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    Not at all, I've been doing that for years. Now you can ride as slowly as you want with no worries your battery isn't being charged sufficiently. You can even disconnect the blue wires to the front turn signals always on feature for even more savings on juice. (At least they are blue after 2001.)
    PlacerLode likes this.
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  5. #4
    Senior Member Fred's Avatar
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    Our experiences indicate that running without the Lo Beam should be OK.
    However there has been theoretical discussions on the forum warning of overloading the voltage regulator/rectifier with a sustained 80 plus watt load at higher RPMs. I do not know the rating of our TW's voltage regulators, nor if there is a variation in rating over the years as stator output has changed since 1987.
    One of my bikes has a low beam cut-out switch. I will utilize it at times at the very least to lessen draw on the battery when engaging the starter motor in cold weather.
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  6. #5
    Senior Member grewen's Avatar
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    i have also installed a low beam turn off switch and a volt meter on my bikes. it is surprising how high the voltage is when running with no headlight
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    Greg

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  7. #6
    Senior Member PlacerLode's Avatar
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    my headlights are always unplugged I usually unplug the high beam
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  8. #7
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by grewen View Post
    i have also installed a low beam turn off switch and a volt meter on my bikes. it is surprising how high the voltage is when running with no headlight
    Should be 13.8 to 14.8.
    Past 15.0 may have a toil on incandescent elements and electronics
    Fred likes this.
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  9. #8
    Senior Member grewen's Avatar
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    Quote Originally Posted by PlacerLode View Post
    my headlights are always unplugged I usually unplug the high beam
    why do you unplug the high beam?
    Greg

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    2018 honda grom
    2018 suzuki dr200

  10. #9
    Senior Member grewen's Avatar
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    Quote Originally Posted by SportsterDoc View Post
    Should be 13.8 to 14.8.
    Past 15.0 may have a toil on incandescent elements and electronics
    it'll raise hell on the battery
    Greg

    2019 honda cb500x
    2018 honda grom
    2018 suzuki dr200

  11. #10
    Super Moderator Purple's Avatar
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    Quote Originally Posted by grewen View Post
    why do you unplug the high beam?
    Because engaging the high beam control then turns the head light off

    In the UK, we have a long history of being able to turn the head lights off – low beam or high beam – we have “off”- “low” – “high” – never blew one up yet ……
    Fred likes this.
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