Reply To: K3 stopped working after BMW GS 1250 Headlight update?

[Hans]

Hi Michael,

Is the fuse still intact?
Is the K3 receiving power on the yellow wire? If it remains powerless, the K3 will no longer switch on automatically.
If you disconnect the power module from the K3 and connect a USB power bank (with sufficient power) via the USB port of the K3, will the K3 start up?

In general, the charging voltage for a motorcycle is around 13.8V.
The K3 can be switched on at voltages lower than 12.5V (I don’t know what the lower limit is). Only at voltages lower than 12.5V will the parking mode not work. The blue LED of the power module will not light up either.

A too low battery voltage can have several causes, including:
– too much power consumer (new headlight?)
– a bad dynamo
– a bad voltage regulator
– a defective battery
– etc.

Can you measure the battery voltage when the battery is connected to the motorcycle and the engine is running? Measuring your battery without a load gives an incorrect indication of your battery status. Even a bad battery can still measure a high voltage. But if a load is connected, it will certainly drop immediately. So measuring with a load gives a better measurement result.