Did you just turn the wheel by hand? The capacitor in the front needs some time to load. Go ride for a minute. Look again.
Nah, after a ride, the front still had some standlight juice but the rear was off. The rear works when riding though. Capacitor a bit shit perhaps?
Alternate/Switch cables of the rear light. The frontlight works on AC, the rearlight on DC. Capacitors only work in one direction.
@hippy started
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Did you just turn the wheel by hand?
The capacitor in the front needs some time to load. Go ride for a minute. Look again.