After connecting the rear light, neither the headlight nor the rear light shine, what to do?

A short circuit may occur due to a faulty rear light or a wrongly connected rear light. If the rear light has ground connection the conductors must not be interchanged: the Edelux ground connection (eyelet connector) must connect to the ground connection on the rear light.
The spade connector female at the Edelux must completely be covered with heat shrink tubing to avoid a short circuit with the Edelux housing.