Battery change - ignition bypass - BMW F800 Riders Forum & Registry



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  1. #1
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    Hi All
    I was hoping someone could help please.

    I’ve just replaced the battery on my 2008 F800GS.
    After connecting the positive lead, when I touch the negative I get a spark and the instrument panel lights up - even though the ignition is off and the key is removed.

    The circuit seems to bypass the ignition switch.
    Any advice would be appreciated.
    Many thanks

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  3. #2
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    Absolutely normal. You will find that the ECU has lost the date and as a consequence you will need to reset it.

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  4. #3
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    Ok thanks.
    So how do I turn the instruments off of the key and ignition are not active?

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  6. #4
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    What are you trying to accomplish exactly?

    When you reconnect the battery the instruments come on for a brief period then extinguish and all is normal except that the current date and time has been lost and as a consequence the service reminder has lost track of when the next service should be and you get an alert when you switch the ignition on.

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  7. #5
    the maz's Avatar
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    The micro switch in the key tumbler might be stuck if the dash stays on without the key in the on position. That is why you are getting a big spark when attaching the battery. This could have been going on before and the reason the previous battery failed.

  8. #6
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  9. #7
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    Getting a spark when connecting a battery is normal on a perfectly functioning bike. That alone isn't indicative of a problem.

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  10. #8
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    But the dash staying on is a problem, likely with the micro switch. The spark will be bigger because of the extra draw with the dash and computer powered up

  11. #9
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    Quote Originally Posted by the maz View Post
    But the dash staying on is a problem, likely with the micro switch. The spark will be bigger because of the extra draw with the dash and computer powered up
    True but thus far the OP hasn't said that the dash is staying on. At least that's my reading.

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  12. #10
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    I thought he said the insturment panel lights up. I took that sas the dash is on without the key. Maybe I am reading to much into it.

  13. #11
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    No, he says in his second post the insturments stay on without the key

  14. #12
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    Quote Originally Posted by the maz View Post
    No, he says in his second post the insturments stay on without the key
    His statement is ambiguous at best.

    Just to restate my own experience with two of these bikes - if a battery has been removed for long enough for the date memory to be lost the dash will illuminate with the key in the off position upon connection of the battery. The dash extinguishes after a short period. When the ignition is turned on the service message appears.



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  15. #13
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    Hi
    Apologies for the ambiguity.
    When I connect the negative lead, the dash all lights up and stays on.

    This happens regardless if the key is in the ignition or which position it’s in.

    This means I cannot turn the instrument panel off unless I disconnect the battery.

    I also tried starting the bike once connected but the bike won’t start.

    Thanks for the help everyone.

  16. #14
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    It sounds to me like maybe the ignition switch had been removed or replaced in the past and was not wired back up correctly.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

  17. #15
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    Quote Originally Posted by Superbok View Post
    Hi
    Apologies for the ambiguity.
    When I connect the negative lead, the dash all lights up and stays on.

    This happens regardless if the key is in the ignition or which position it’s in.

    This means I cannot turn the instrument panel off unless I disconnect the battery.

    I also tried starting the bike once connected but the bike won’t start.

    Thanks for the help everyone.
    How long do you leave it too see if the speedo display turns off? Are there any warning lights or messages in the display.

    When you say it does not start - is there any response? Does the display change or starter motor operate?
    Battery polarity reversed by any chance?
    I.e. correct battery????
    Wonder if its worth trying to read error codes with motoscan/gs911??
    F800GT in blue known as "The Blue Bat"
    Based near Peterborough, Cambridge, UK 

  18. #16
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    Also, make sure that the "kill" switch is in the "run" position. Are you hitting the starter button with the side stand fully retracted and the clutch pulled in? On some bikes, the side stand safety interlock switch can fail and cause the engine not to start.

    However, it continues to sound to me like there is something goofy about how the ignition switch is wired. Either that or there is a short somewhere in the wiring loom.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

  19. #17
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    Quote Originally Posted by zoefoster View Post
    amazing
    Zoefoster, have you tried posting your random adjectives in the "Word Association" thread? Straighten up or it will be in the spam dumpster for you.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

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