Follow the instructions on the Quick Installation Guide to connect the charger to the collar. The collar should display a steady orange light while charging and a steady green light when charging is complete.
Make sure that the brass pins on the charger are aligned with the connectors on the inside of the collar.
Inspect the connectors socket on the inside of the collar for dirt or fur. You can easily clean the socket with an alcohol soaked q-tip.
The wings of the charger must both snap into place in the grooves on both sides of the collar. The charger should hold firmly on the collar.
It is sometimes necessary to jiggle the collar a bit or push it firmly into the charger to achieve good contact.
Make sure the orange LED on the collar stays on AFTER you place the collar on the charger, as sometimes the charger may get loose from the impact of a drop on the counter.