Hi Tango,
not sure about the points ignition ?
May work even if battery voltage is low 🙂
Contactless ignition of B3 and later will let you down if there is not sufficient battery voltage !
Turning the lights off in such a moment is a help, but will last for only 50 or maybe 100 km.
Using the winker (or the horn) and in same rythm motor stops working reminds you, that ignition is running on battery only 😉
Does the starter relais click ?
Cheers, Michael
