749 Battery Voltage Display All Over The Place

Discussion in '749 / 999' started by Simon Raglione, Mar 30, 2026 at 5:28 PM.

  1. Been getting a lot of miles down on my 749 post big service.
    A fair chunk of these are following my other half on her RS660 while she finds her feet having got her full license.
    This has left me with a bit more time to contemplate my bike.
    The LCD display for battery voltage wanders round all over the place, I always expect a charging voltage to be somewhere around 14v with the engine running but i rarely see anything like that, it often show values around the 11v mark. Every time it drops obviously it starts flashing and the "right hand" bottom value flicks to battery voltage. 10 seconds later, back up over 12
    Bike runs fine, starts fine, must be charging or the battery would have been way flat by now as we have ridden in the dark for hours etc, etc.
    Have tried searching for info but lots of feedback is about bikes not charging whereas mine seems to be charging fine but the display doesn't agree.
    Is it likely to be an actual charging issue and the battery is charging just not very well or is there a device somewhere measuring the voltage that has a dogy earther or something.
    I kept clicking the right button on the display to clear it, then the button fell off so now i need one of those!
     
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  2. In these instances black insulation tape is your friend
     
  3. One day either your regulator-rectifier or your battery - or both - will fail leaving you stranded in the middle of nowhere.

    Or you could sort it properly.
     
    • Agree Agree x 2
  4. As happened to me in the outside lane of a motorway. All power was lost leaving me to filter through the fast moving two lanes and onto the hard shoulder.
     
  5. Battery was new last summer, maybe reg rec?
     
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