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Thread: Battery Light - 2004 R1150

  1. #1
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    Battery Light - 2004 R1150

    Got the bike out for a ride and upon start up the battery light was on. It was off by the time I left the driveway, but I'm not sure what the light is telling me (I don't have a manual). I had the bike on a tender a couple weeks ago so it wouldn't surprise me if it's a little flat. Should I be thinking new battery time? (Battery came with the bike, which I got in mid 2018)

    Thanks
    2004 R1150R Rockster | 1981 R100 | 2019 KLX250 | 1980 R65 (sold)

  2. #2
    Registered User dieselyoda's Avatar
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    Start with fuses as in pull each one out and look closely for a burnt or corroded one.

    I believe that if the light is on, you are not charging the battery. That could still mean a battery that won't take a charge or the alternator/belt has gone bad.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  3. #3

    yes

    I got the battery light too just as I was going into strip down mode to upgrade my suspension on the R1100S. Several hours on here and youtube suggest charge to full capacity and use an ammeter and get close to 12,75 then crank it on and hope to see 13/14 . If it's a standard lead acid battery you could be at its end of life , but I am just parroting youtube so do your own research.

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    I found a thread on ADV rider that said this was something normal. Just need to bump the revs up a little at the beginning and then it's all good. It's done it before, but I finally thought to ask. And, well, it did drop off a bit over the winter and needed the charger so it might be dying.
    2004 R1150R Rockster | 1981 R100 | 2019 KLX250 | 1980 R65 (sold)

  5. #5
    The behavior described in the original post was pretty typical for my R1150R. Four point voltage readings would help: Key off standing voltage, key on standing voltage, starter cranking voltage, and engine running voltage.

    That might look like 12.7volts, 12.1volts, 11.0 volts, 14.3 volts with a sound system.
    Last edited by PGlaves; 04-07-2021 at 06:04 PM.
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  6. #6
    Registered User jnrugg's Avatar
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    On my 1150RT the light is on until I blip the throttle.
    I installed a volt meter in the dash so I know what the voltage is.

  7. #7

    Voltmeters

    Speaking of voltmeters, which units work well on these bikes?
    Charlie P.
    1992 R100R
    1996 R1100GS

  8. #8
    Registered User dieselyoda's Avatar
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    If you need to blip the throttle, you are "exciting" the field which generally means your brushes are getting worn out.

    Just a thought but I would tend to ignore it because it could be fine for many, many years.

    As to Voltmeters, I found mine on Amazon and it was about 1.5" in diameter and digital.

    I put mine dead center of the instrument trim right above the instruments.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  9. #9
    Registered User jnrugg's Avatar
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    I put one in that little square space lower left.
    If you do this get a red one, I have blue on another bike and it's hard to read.

  10. #10
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    Red's not much better in the daylight. LCD would be my choice.
    '79 CB750L, '80 CB750C, '81 CB900C, '04 RTP: "We hates it 'til we rides it!"

  11. #11
    Left Coast Rider
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    Quote Originally Posted by jnrugg View Post
    On my 1150RT the light is on until I blip the throttle.
    My 1100S did this for as long as I owned the bike - from 0 to 119,000 km. I came to rely on it to tell me my charging system was working. The day its doesn't light up when you turn the key on but before you start the bike, check the bulb. I believe that if the bulb is burned out your battery will not charge.

  12. #12
    Registered User dieselyoda's Avatar
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    Quote Originally Posted by BC1100S View Post
    My 1100S did this for as long as I owned the bike - from 0 to 119,000 km. I came to rely on it to tell me my charging system was working. The day its doesn't light up when you turn the key on but before you start the bike, check the bulb. I believe that if the bulb is burned out your battery will not charge.
    Correct, the light for the alternator/battery must come on so the voltage regulator has some current go through it before it does what it is supposed to do.

    If your charging system is working, I don't mess with the quirks. If my battery is charged in the morning, starts all day, I wouldn't be concerned.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  13. #13
    Pepperfool GSAddict's Avatar
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    Using the correct lamp in the charge light is critical for low rpm excitation of the oilhead alternators

    Confirm the lamp is a 3 watt and not a 1.7w

    62 14 2 306 126 BULB - 12V 3W

    The correct type may need to be confirmed by measuring the current which should be 250mA @ 12v or ordering the correct one from the dealer.
    They are not always marked.
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  14. #14
    Registered User jnrugg's Avatar
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    Quote Originally Posted by 179411 View Post
    Red's not much better in the daylight. LCD would be my choice.
    This is what I bought.
    https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

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