Join Date: Sep 2004
Location: Medford, County of Jackson, Oregon, USA
Model: None at present
The starter button is supposed to open the headlight circuit, if the headlight is still on when you crank the engine it's not surprising it would do so poorly in cold weather. In the headlight circuit there's two wires that go from both high and low beam terminals on the bulb to the high, low switch on the left handlebar. The common headlight wire from this switch goes to a normally closed contact on your starter button on the other handle bar and from there to the ignition switch and eventually to a fuse in the fuse box which supplies the 12V. The problem would appear to be in the starter switch on the handlebar, it is not opening the pole on the side that controls the headlight. The other pole of the switch that closes to initiate the start circuit is still working. You might try taking the switch apart since something obviously came loose inside or the switch welded itself closed. Most likely you'll need to hunt for a new control.
None at present
Past 'Wings: GL1100, GL1200, GL1500, GL1800
Current BMW C650GT