Question about 2008 BMW K 1200 GT

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I have a 2002 K1200LT. It seems that the battery is losing voltage and does not start the bike. It is a second new battery and is charged. When charged it starts the bike ok but after a couple of days it struggles to start. It looks like a flat battery again. When I jump start it not a problem. Any suggestions.

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It sounds like there is something draining your battery such as an alarm. I would start by charging the battery up and checking the bike starts ok. Then totally isolate the battery and wait a few days. Reconnect it, does the bike start? If no, then its a bad battery (just because its new doesnt mean its good).
If you have a multimeter you can use this to find what is causing the problem. This can be acheived by putting it in series with the battery. There will be some current drain, but no more than around 50mA. If you have a larger drain then start by removing one fuse at a time and see if the current drain reduces to an acceptable level.
This should then help identify which circuit is giving you the problem.

Posted on Oct 17, 2013

  • Michael Bregman
    Michael Bregman Oct 18, 2013

    Hi, thanks, I have recharged the battery. The bike started with ease. I never had this problem until I can to Kalgoorlie WA. I do not use the bike to often now because I live 5 mins from work. From what I have read, i need to keep the battery on a tender so it maintains its full charge over 4 or 5 days. Like you have said the alarm draw current which seems to reduce the battery voltage over 4 or 5 days.



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Posted on Jan 02, 2017

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SOURCE: bad battery

Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else. Was the new battery properly charged to begin with? Loose battery connection? I suppose the GPS could be too much but you said that it was dying last november, so I would suspect something else. P.S. you need a properly charged battery to get an accurate reading for the charging test.

Posted on Nov 20, 2008

  • 14 Answers

SOURCE: VERY New F800ST won't start

may be because charge on bike's battery went down.
you may have to charge it.

Posted on Jan 22, 2009

  • 26 Answers

SOURCE: 2002 BMW F650 GS jumping out of gear

It is the dogs on the gears themselves that are worn. Only solution is to replace them, which means an engine strip or full replacement with another engine from a salvage shop.

Posted on Aug 23, 2009

  • 163 Answers

SOURCE: My 2006 BMW G650 has a brand new battery that died after 3 weeks

Sounds like you need to check your charging system.Battery when engine running alittle over idle should charge at 14.5 volts. If it does not check the output of your stator by testing lead at the regulator rectifier... It may be you have a bad regulator rectifier...

Posted on Sep 03, 2009

  • 1 Answer

SOURCE: Bike starts but won't idle

I'm having a similar electrical/idling problem with my Dakar with 6K miles on it and 2 seasons on battery. What did you finally determine as cause?

Posted on Mar 22, 2010

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The battery may have developed a dead cell.
Try jumping the battery and see if it starts.
If it does, at least one cell in the battery is shot. or the system isn't charging the battery.
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Sounds like the charging system doesn't.

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My bike has a brand new battery in it but refuses to turn over and start the engine. I can push start the bike but would like for it to start without trouble. Is it the stattor?

If there is excessive resistance in the path of the power being provided to the starter, it will engage but turn over slowly. But this will not rapidly drain the battery as you describe. (It will drain the battery, but more slowly than you seem to be describing, as I read between the lines.)

If the engine is very hard to turn, the starter won't be able to do the job, and will drain the battery pretty quickly. A starter motor that is energized, but is being held from moving operates electrically essentially as a piece of wire. But you can push start it, so that doesn't sound like what's going on.

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