VARTA 631 Warning Lamp April 28, 2023, 08:42:24 AM Although the lamp was only mandatory for trucks,some used it as a security precaution, in the 80's.As in an Etsy-Auction:The flasher is on the front and the steady light on the side.It is powered by 5 mono cells, which makes it rather heavy.In the new times, a friend has put in LED's,a Li-Ion-Cell and some electronics in between.Since they do not take as long to light up,one could shorten the flashing by bridging the middle resistorof the 5 you see after opening the case, he figured. Last Edit: April 30, 2023, 06:00:31 PM by mk24ever