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  • #1

    battery draining"

    i have a xs midnight special 1981
    problem is when lights are on battery drains""after an hour os so"
    if i remove the light fuse it seems ok""
    any idears ????
    have had battery checked on bike whilst running and is charging ok""
    so think it must be shorting some wear in the loom but dont no "help
    ITS NICE TO BE IMPORTANT"
    BUT MORE IMPORTANT TO BE NICE"
    Tags: None
  • #2
    Hey there Noby,

    You say it's charging okay, but what are the voltage values at what RPM? It should be ~14.5 volts at 2+krpm. If you are doing lots of diagnostics and running it only at idle , then it's not runnig fast enough to properly charge the battery, and so, yes, the lights will draw more off of it than what it will be charging during that idle time. But if you are talking about after an hour or so of riding where you ARE running above 2krpm, then you may have a charging problem afterall!? Also, how old is battery? How clean are the contacts, both + & -, clean ground, etc., a poor ground will prevent it from recharging properly!
    T.C.
    T. C. Gresham
    81SH "Godzilla" . . .1179cc super-rat.
    79SF "The Teacher" . . .basket case!
    History shows again and again,
    How nature points out the folly of men!

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    • #3
      charging

      yes is tHRowing out 14.5 at 2000 rpm
      it is drained after a journey so much so that it starts miss fireing because its dead i.e. battery"
      its a new battery" contact are clean" grounds have been cleaned""
      its a mistery""" ""HELPPPP"
      ITS NICE TO BE IMPORTANT"
      BUT MORE IMPORTANT TO BE NICE"

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      • #4
        What is the wattage of the head lamps? If they are more than stock and you do a lot of traffic, stop and go driving, you can lose charge in a hurry. Those bulbs from JCWhipme are absolute crap. I think I tried a 100W/65W bulb (can't exactly remember) that was not as bright as the one I am using now, which is a Sylvania Silver Star bulb rated same as stock. I am pleased with it. Also, I don't know when you checked the battery, but :
        (1)They can fool you by showing a good "skin charge" without having any real storage capacity.
        (2) The only way to really test a battery is with a load test, like hitting the starter while checking its volts, or let a professional test it for free.
        (3) They can "act-up" after they get warm and short out.
        (4) They can be bad from the dealer.
        Skids (Sid Hansen)

        Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

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        • #5
          Read the FAQ on this page about that problem.
          http://www.oregonmotorcycleparts.com/FAQ.html


          Geezer
          Hi my name is Tony and I'm a bikeoholic.

          The old gray biker ain't what he used to be.

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          • #6
            battery

            most helpfull many thanks to all i will check it out
            cheers rick
            ITS NICE TO BE IMPORTANT"
            BUT MORE IMPORTANT TO BE NICE"

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