Thanks much for the infos.

To make things easier, the AXA HR Traction has 2x2 plugs (two OUT, two IN), so that using the frame as return/ground/earth is not required. It only takes a screwdriver to remove the black cap and insert the wires.

After swapping the two wires that go to the front light, it worked. And the rear light worked right the first time :


For my — and possibly other newbies' — education:

1. What's the poinf of the two "OUT" plugs in the back of the front light, each with a different symbol attached (thunder and ground)? Can/should I use them?



2. The bracked to hold the dynamo has a sharp screw in the middle to dig into the fork/stay: Do I need this, or can I remove it and avoid damaging the frame?



Thank you.