I'm a novice re fitting a dynamo. I've just been fitting it - front light, rear light & dynamo. I had all items assembled on the bike and turned the pedals forward and heh presto, light emitting from front and rear!!
The problem is, I hadn't reassembled everything (eg. rear mudguard), as I hadn't wanted to do this until certain all worked. After tinkering around a little (i.e., slightly altering the placement of the dynamo, moving the wires to ensure they weren't in the way of the wheels etc.) I thought I'd perform a second demonstration to myself. However, when I turned the pedals the lights were not now emitting light! Big disappointment.
What could have gone wrong? I'm using a double cable on each light (front & rear). I didn't change any wires around whilst "tinkering". I'm using a B & M seculite plus rear light, a B & M Lumotec plus front light and a Nordlicht 2000 Dynamo.
Suggestions very much appreciated.