The First Design

The first design had a current protection. The shown hand-drawn schematic is broken into three pieces.

The current for triggering the protection in the third part of the schematic was set at about 0.8A. The protection worked well within the bench circuit but not on the bike, as there the protection turned out to be extremely sensitive to humidity. A contributing issue was that on the bench I used an incandescent lamp rather than a halogen. For an incandescent the resisitance is pretty stable, around 12 Ohm. However, a cold halogen has a resistance below 2 Ohm that raises only as the halogen heats up. Thus, on the bike there was an initial rush of the current that easily triggered the protection.